Endocrine glands

It acts like a “light sensor” in the brain — even though it doesn’t detect light directly, it receives signals from the eyes via the suprachiasmatic nucleus (SCN) of the hypothalamus.

💧 Main Secretion: Melatonin

🧪 Melatonin

A hormone made from the amino acid tryptophan (via serotonin).
Produced in darkness, inhibited by light.
Highest production: nighttime, especially between 11 PM – 3 AM.
Helps you:
- Fall asleep
- Stay asleep
- Maintain regular sleep patterns

Melatonin also influences:

Body temperature
Blood pressure
Mood
Seasonal reproductive cycles (in some animals and possibly humans)

🔁 Melatonin Pathway

Tryptophan (from food)
→ Converted to Serotonin (a feel-good neurotransmitter)
→ Converted to Melatonin (at night, by pineal gland)

🧬 Other Possible Secretions (Less Confirmed)

Dimethyltryptamine (DMT) – Some theories (especially in mystical and psychedelic studies) suggest the pineal gland may produce DMT, a powerful psychoactive compound, but this is not conclusively proven in humans.
Pinoline – A beta-carboline possibly produced in the pineal, believed to have mild psychoactive effects, but evidence is limited.

🧘‍♂️ Spiritual & Yogic Significance

Known as the “Third Eye” or Ajna Chakra in yogic and esoteric traditions.
Associated with intuition, inner vision, and spiritual insight.
Believed to awaken during deep meditation, prāṇāyāma, or kundalini practices.

📚 Summary Table

Feature	Details
Location	Center of the brain, near thalamus
Shape/Size	Pine-cone shaped, about 5–8 mm
Primary Function	Regulates sleep-wake cycles
Main Hormone	Melatonin
Secreted When	During darkness/night
Controlled By	Light signals via the hypothalamus
Spiritual Role	“Third Eye” – awareness and intuition

Would you like a diagram showing where it is located in the brain? Or more on how to naturally support pineal gland health (diet, habits, yoga, etc.)?

Pituitary gland-

The pituitary gland, often called the “master gland”, is a small but crucial endocrine gland that controls many other glands and body functions through hormone secretion.

🧠 Basic Overview

Feature	Description
Location	Base of the brain, below the hypothalamus
Size	About the size of a pea (8–10 mm)
Connection	Directly connected to the hypothalamus
Divisions	Anterior lobe, Posterior lobe, and Intermediate lobe

🔍 Functions of the Pituitary Gland

1. Controls Other Endocrine Glands

It regulates the thyroid, adrenal glands, ovaries, testes, and more.

2. Regulates Vital Body Functions

Growth, metabolism, stress, reproduction, and water balance.

🧪 Hormones Produced

✅ Anterior Pituitary (Adenohypophysis)

Hormone	Function
GH (Growth Hormone)	Stimulates growth of bones and tissues
TSH (Thyroid-Stimulating Hormone)	Stimulates thyroid gland to produce hormones
ACTH (Adrenocorticotropic Hormone)	Stimulates adrenal cortex (cortisol)
FSH (Follicle-Stimulating Hormone)	Controls reproductive processes
LH (Luteinizing Hormone)	Triggers ovulation, testosterone production
PRL (Prolactin)	Stimulates breast milk production

✅ Posterior Pituitary (Neurohypophysis)

Hormone	Function
ADH (Antidiuretic Hormone / Vasopressin)	Controls water balance by acting on kidneys
Oxytocin	Stimulates uterine contractions and milk ejection

⚖️ Regulation

The hypothalamus controls the pituitary gland through releasing and inhibiting hormones.
This interaction forms the hypothalamic-pituitary axis, crucial for homeostasis.

🧬 Disorders of the Pituitary

Disorder	Description
Pituitary adenoma	Benign tumor affecting hormone secretion
Acromegaly	Excess GH in adults, leads to enlarged hands, face
Gigantism	Excess GH in children before bone growth plates close
Diabetes insipidus	ADH deficiency, causing excessive thirst and urination
Hypopituitarism	Reduced hormone production affecting multiple systems

🧘 Spiritual & Symbolic Note

In some yogic and esoteric traditions, the pituitary gland is associated with the Ajna Chakra (third eye), often paired with the pineal gland. It’s thought to govern intuition, wisdom, and inner vision.

Would you like a comparison between the pituitary and pineal glands, or an explanation of how they interact in meditation and yoga?

Here’s a comparison between the pituitary and pineal glands, followed by how they interact in meditation and yoga contexts:

🔬 Comparison: Pituitary vs Pineal Gland

Feature	Pituitary Gland	Pineal Gland
Location	Base of the brain, behind the bridge of the nose	Deep in the center of the brain, near the thalamus
Size	About the size of a pea	About the size of a grain of rice
Also Called	The “Master Gland”	The “Third Eye” (in spiritual/yogic terms)
Primary Function	Secretes hormones that regulate other endocrine glands	Produces melatonin, regulates sleep-wake cycles
Hormones Produced	GH, TSH, ACTH, FSH, LH, PRL, ADH, Oxytocin	Melatonin
Control Over	Thyroid, adrenal glands, reproductive organs, growth	Circadian rhythms, sleep, inner biological clock
Influence by Light?	No direct influence	Yes, sensitive to light/dark cycles
Spiritual Significance	Associated with Ajna Chakra (sometimes Sahasrara too)	Strongly linked with Ajna Chakra (Third Eye)

🧘‍♀️ Role in Meditation & Yoga

In traditional yogic philosophy and spiritual science, both the pineal and pituitary glands are believed to play crucial roles in consciousness expansion, inner awareness, and spiritual awakening.

🌌 1. Ajna Chakra Activation (Third Eye)

The pineal gland is often considered the physical counterpart of the Ajna chakra, or “third eye.”
It is believed to be responsible for intuition, insight, inner vision, and spiritual perception.
Regular meditation, prāṇāyāma, and dhyāna stimulate this gland, enhancing subtle awareness.

🕉 2. Pituitary and Sahasrara (Crown Chakra)

The pituitary gland is sometimes associated with the Sahasrara chakra (crown) due to its “master” role.
It’s considered to regulate spiritual energy and higher states of consciousness.
In deep meditation, this gland may be “stimulated” to release certain neurochemicals (endorphins, oxytocin), producing blissful or transcendent states.

🌠 3. Interaction in Yogic Terms

Yogis say that when the pineal (third eye) and pituitary (crown) are activated in balance, a bridge of light (called “Amrita Nadi” or “Light Channel”) is formed.
This results in:
- Spiritual illumination
- Blissful meditative states
- Sense of oneness with the cosmos

🫁 4. How Practices Help

Practice	Effect on Glands
Prāṇāyāma	Oxygenates brain, stimulates pineal/pituitary
Meditation (Dhyāna)	Quietens mind, opens Ajna chakra, triggers inner light
Trāṭaka (Gazing)	Directly stimulates Ajna chakra and pineal gland
Kundalini Yoga	Aims to raise energy through all chakras, ending in activation of pineal and pituitary centers

🔮 Summary

Pituitary gland governs the physical body’s endocrine balance, acting as the controller.
Pineal gland governs inner rhythms, intuition, and spiritual insight.
In yogic practice, these glands represent gateways to higher consciousness and are stimulated through breath, focus, and meditation.

🔬 Comparison: Pituitary vs Pineal Gland

Feature	Pituitary Gland	Pineal Gland
Location	Base of the brain, behind the bridge of the nose	Deep in the center of the brain, near the thalamus
Size	About the size of a pea	About the size of a grain of rice
Also Called	The “Master Gland”	The “Third Eye” (in spiritual/yogic terms)
Primary Function	Secretes hormones that regulate other endocrine glands	Produces melatonin, regulates sleep-wake cycles
Hormones Produced	GH, TSH, ACTH, FSH, LH, PRL, ADH, Oxytocin	Melatonin
Control Over	Thyroid, adrenal glands, reproductive organs, growth	Circadian rhythms, sleep, inner biological clock
Influence by Light?	No direct influence	Yes, sensitive to light/dark cycles
Spiritual Significance	Associated with Ajna Chakra (sometimes Sahasrara too)	Strongly linked with Ajna Chakra (Third Eye)

🧘‍♀️ Role in Meditation & Yoga

🌌 1. Ajna Chakra Activation (Third Eye)

The pineal gland is often considered the physical counterpart of the Ajna chakra, or “third eye.”
It is believed to be responsible for intuition, insight, inner vision, and spiritual perception.
Regular meditation, prāṇāyāma, and dhyāna stimulate this gland, enhancing subtle awareness.

🕉 2. Pituitary and Sahasrara (Crown Chakra)

The pituitary gland is sometimes associated with the Sahasrara chakra (crown) due to its “master” role.
It’s considered to regulate spiritual energy and higher states of consciousness.
In deep meditation, this gland may be “stimulated” to release certain neurochemicals (endorphins, oxytocin), producing blissful or transcendent states.

🌠 3. Interaction in Yogic Terms

Yogis say that when the pineal (third eye) and pituitary (crown) are activated in balance, a bridge of light (called “Amrita Nadi” or “Light Channel”) is formed.
This results in:
- Spiritual illumination
- Blissful meditative states
- Sense of oneness with the cosmos

🫁 4. How Practices Help

Practice	Effect on Glands
Prāṇāyāma	Oxygenates brain, stimulates pineal/pituitary
Meditation (Dhyāna)	Quietens mind, opens Ajna chakra, triggers inner light
Trāṭaka (Gazing)	Directly stimulates Ajna chakra and pineal gland
Kundalini Yoga	Aims to raise energy through all chakras, ending in activation of pineal and pituitary centers

🔮 Summary

Pituitary gland governs the physical body’s endocrine balance, acting as the controller.
Pineal gland governs inner rhythms, intuition, and spiritual insight.
In yogic practice, these glands represent gateways to higher consciousness and are stimulated through breath, focus, and meditation.

Would you like a guided Ajna Chakra meditation or an illustration showing the pineal/pituitary positions with chakras?

HORMONES AND THEIR USES

Anterior pituitary:-
Somatotrope-somatostanin
Corticotrope-corticotroposin
Thyrotrope-Thyrotropsin
Gonadotrope- Leiutanizing hormone and Follicle stimulating hormone
Lactotrope- Prolatin

Intermediate pituitary:-
Melenocyte stimulating hormone

Posterior pituitary:-
Antidiuretic hormone or Vassopressin
Oxytocin

Uses:-
Growth
Urin contraction
Child birth
Breast feeding
Sex hormone
Metabolism
Osmoregulation
Regulates Thyroid hormones, Temperature
Pain relief

Thyroid gland-

The thyroid gland is a butterfly-shaped endocrine gland located in the front of the neck. It plays a crucial role in regulating the body’s metabolism, energy levels, and overall growth and development.

🧠 Key Overview

Feature	Description
Location	Front of the neck, below the Adam’s apple
Shape	Butterfly-shaped, with two lobes connected by an isthmus
Function	Produces hormones that regulate metabolism
Controlled by	Pituitary gland (via TSH – Thyroid Stimulating Hormone)

⚙️ Main Functions

Regulates Metabolism
- Controls how fast or slow your body uses energy.
Supports Growth and Development
- Especially important for brain development in infants and children.
Helps Maintain Body Temperature
- Regulates heat production in cells.
Supports Heart, Muscle, and Digestive Function

🔬 Hormones Produced

Hormone	Function
T3 (Triiodothyronine)	Active form; regulates metabolism in cells
T4 (Thyroxine)	Converted into T3 in tissues
Calcitonin	Helps regulate calcium levels in the blood and bones

T3 and T4 are made using iodine, which is why dietary iodine (from salt, seafood) is important.

🔄 Regulation of the Thyroid

Hypothalamus releases TRH (Thyrotropin-releasing hormone)
TRH signals the pituitary to release TSH (Thyroid Stimulating Hormone)
TSH tells the thyroid gland to release T3 and T4

This feedback loop helps maintain hormone balance.

⚠️ Common Thyroid Disorders

Disorder	Description
Hypothyroidism	Underactive thyroid (fatigue, weight gain, cold sensitivity)
Hyperthyroidism	Overactive thyroid (weight loss, anxiety, heat intolerance)
Goiter	Enlarged thyroid, often due to iodine deficiency
Hashimoto’s Thyroiditis	Autoimmune condition causing hypothyroidism
Graves’ Disease	Autoimmune condition causing hyperthyroidism
Thyroid nodules	Lumps that may be benign or cancerous

🧘 In Yoga & Symbolism

Associated with the Vishuddha Chakra (Throat Chakra)
Governs communication, truth, and expression
Practices like shoulder stand (Sarvangasana) are believed to stimulate the thyroid.

🧪 Simple Tests

TSH test: Most common blood test to check thyroid function
T3, T4: Measured to assess hormone levels
Ultrasound or scan: For structural abnormalities

Would you like a comparison between the thyroid, pituitary, and pineal glands, or guidance on diet/exercises that support thyroid health?

PHYSICAL POSSITION AND MAIN HORMONE :Thyroxin T4
The thyroid, or thyroid gland,Thyroid gland- is an endocrine gland in the neck consisting of two connected lobes. The lower two thirds of the lobes are connected by a thin band of tissue called the thyroid isthmus. The thyroid is located at the front of the neck, below the Adam’s apple.

Parathyroid gland-

The parathyroid glands are small, pea-sized endocrine glands located behind the thyroid gland in the neck. They play a vital role in regulating calcium and phosphorus levels in the blood and bones.

🧠 Basic Overview

Feature	Description
Number	Usually 4 (can range from 2 to 6)
Location	Behind or embedded in the thyroid gland lobes
Size	About 3–5 mm, like a grain of rice or a pea
Main Hormone	Parathyroid Hormone (PTH)
Main Function	Regulates calcium and phosphate in blood

🔬 Function of Parathyroid Glands

The parathyroid glands monitor blood calcium levels and respond when calcium levels drop. Calcium is essential for:

Muscle contraction (including the heart)
Nerve signaling
Bone strength
Blood clotting

✅ Parathyroid Hormone (PTH):

PTH increases blood calcium levels by:

Stimulating bone breakdown (releasing calcium into blood)
Increasing calcium reabsorption in kidneys
Promoting calcium absorption from food (indirectly via vitamin D activation)

🔄 Regulation System

Condition	Parathyroid Response
Low blood calcium	↑ PTH secretion → ↑ blood calcium
High blood calcium	↓ PTH secretion → ↓ blood calcium

⚠️ Disorders of the Parathyroid

Disorder	Description
Hyperparathyroidism	Overproduction of PTH → high blood calcium (weak bones, kidney stones)
Hypoparathyroidism	Underproduction of PTH → low calcium (muscle cramps, spasms)
Parathyroid adenoma	Benign tumor causing excess PTH

🧪 Diagnostic Tests

Blood tests: PTH, calcium, phosphorus levels
Bone density test: To assess calcium loss from bones
Imaging: Ultrasound, Sestamibi scan for gland visualization

🧘 Yogic Viewpoint

While less frequently mentioned in spiritual texts, parathyroid health is indirectly supported by practices that:

Promote hormonal balance (like deep breathing)
Improve calcium metabolism (like sun exposure for Vitamin D synthesis)
Reduce stress, which impacts all endocrine function

🧂 Nutritional Support

Nutrient	Importance	Sources
Calcium	Needed for balance	Dairy, leafy greens, sesame, almonds
Vitamin D	Helps calcium absorption	Sunlight, mushrooms, fortified foods
Magnesium	Supports calcium regulation	Nuts, seeds, legumes

Summary

Gland	Hormone	Key Function
Parathyroid	PTH	Regulates blood calcium levels
Thyroid	T3/T4	Controls metabolism

Would you like a visual comparison of the thyroid and parathyroid glands, or guidance on yoga/diet to support calcium balance naturally?

Parathyroid glands are four small glands of the endocrine system which regulate the calcium in our bodies. Parathyroid glands are located in the neck behind the thyroid where they continuously monitor and regulate blood calcium levels.

Pancreas-

The pancreas is a unique gland because it functions both as an endocrine and exocrine gland. It plays a central role in both digestion and blood sugar regulation.

🧠 Basic Overview

Feature	Description
Location	Behind the stomach, in the upper abdomen
Length	About 15–20 cm (6–8 inches)
Type	Both endocrine (hormone) and exocrine (digestive)

🔬 Functions of the Pancreas

✅ 1. Endocrine Function (Hormonal – inside the body)

Regulates blood sugar
Controlled by Islets of Langerhans (clusters of hormone-producing cells)

Hormone	Secreted by	Function
Insulin	Beta (β) cells	Lowers blood sugar by helping cells absorb glucose
Glucagon	Alpha (α) cells	Raises blood sugar by releasing glucose from the liver
Somatostatin	Delta (δ) cells	Regulates insulin and glucagon
Pancreatic Polypeptide	PP cells	Regulates pancreatic secretions

✅ 2. Exocrine Function (Digestive – outside into the intestine)

Secretes digestive enzymes into the small intestine (duodenum) via the pancreatic duct

Enzyme	Role
Amylase	Breaks down carbohydrates
Lipase	Breaks down fats
Trypsin & Chymotrypsin	Break down proteins
Bicarbonate ions	Neutralize stomach acid

⚠️ Disorders of the Pancreas

Condition	Description
Diabetes Mellitus	Insulin deficiency or resistance (Type 1 or 2)
Pancreatitis	Inflammation of the pancreas (acute or chronic)
Pancreatic Cancer	A serious and often aggressive cancer
Cystic Fibrosis	Affects digestive enzyme production

🧪 Tests and Diagnosis

Blood sugar tests (Fasting glucose, HbA1c)
Insulin/glucagon levels
Amylase and lipase levels (for pancreatitis)
Imaging: CT scan, MRI, or ultrasound

🥗 Nutrition Tips for Pancreas Health

Avoid excessive sugar and fat
Eat fiber-rich foods (vegetables, fruits, whole grains)
Stay hydrated
Avoid alcohol (especially to prevent pancreatitis)

🧘 Yoga & Holistic Health

In Ayurveda and yogic practice, the pancreas is connected with:

Manipura Chakra (Solar Plexus) — the seat of digestion, energy, and vitality.
Yoga poses like twists (Ardha Matsyendrasana) and forward bends stimulate the pancreas and improve digestion and sugar metabolism.

Summary Table

Function	Type	Involves
Blood sugar regulation	Endocrine	Insulin, Glucagon (Islets of Langerhans)
Digestive enzyme secretion	Exocrine	Amylase, Lipase, Proteases

Would you like an illustration of the pancreas’ location and functions or help with understanding diabetes and how it connects to the pancreas?

Endocrine Hormone-

Insulin-lessons glucose
Glucogon-induses glucose

Exocrine Enzymes

Chymotrypsin-digests Protine
Trypsin-dijests Protine
Amylase-digests Statch sugar carbohydrate
Lypase-digests fat and lipid

Pineal gland-

Melatonin – sleep indusing hormone

The pineal gland is a small, pea-shaped endocrine gland located deep in the center of the brain, between the two hemispheres, in a groove where the two halves of the thalamus join. Despite its small size, it plays a very important role in regulating biological rhythms.

🧠 Key Facts about the Pineal Gland:

Location: Epithalamus, near the center of the brain.
Size: About 5–8 mm long.
Shape: Resembles a tiny pine cone (hence the name “pineal”).

🌙 Functions:

1. Melatonin Production

The pineal gland’s primary function is to produce and regulate melatonin, a hormone that controls the sleep-wake cycle (circadian rhythm).
Melatonin levels increase in the dark and decrease in the light, helping you fall asleep at night and wake up in the morning.

2. Biological Clock

Acts as the body’s “biological clock” regulator by synchronizing internal processes with day-night cycles.

🌞 Light and the Pineal Gland:

The gland is indirectly sensitive to light via the retinohypothalamic tract, which carries information from the eyes to the suprachiasmatic nucleus (SCN) of the hypothalamus. The SCN then signals the pineal gland.
Daylight inhibits melatonin production.
Darkness stimulates melatonin release.

🔮 Spiritual and Philosophical Aspects:

In many traditions (especially in Eastern philosophy), the pineal gland is associated with the “third eye” and spiritual insight.
Descartes called it the “seat of the soul”, believing it to be the point of connection between the mind and body.

🧬 Health and Disorders:

Pineal gland calcification can occur with age, potentially reducing melatonin production.
Disorders include:
- Insomnia
- Seasonal Affective Disorder (SAD)
- Sleep disorders
- Rarely, pineal tumors

Summary Table:

Feature	Details
Location	Center of the brain, near the thalamus
Hormone produced	Melatonin
Function	Regulates sleep-wake cycle
Trigger	Darkness stimulates melatonin production
Associated with	Circadian rhythms, spiritual awareness

Would you like to explore its role in yoga, meditation, or modern neuroscience in more depth?

Thymus gland-

The thymus gland is in the chest between the lungs. It makes white blood cells (T lymphocytes) which are part of the immune system and help fight infection. The thymus gland is in the chest, between the lungs and behind the breastbone (sternum). It is just in front of, and above, the heart.

The thymus gland is a specialized lymphoid organ that plays a vital role in the immune system, especially during childhood and adolescence. It is essential for the development of T-cells (T-lymphocytes), which defend the body against pathogens.

🧠 Basic Overview

Feature	Description
Location	Upper chest, behind the sternum (breastbone)
Size	Larger in children, shrinks after puberty
System	Immune and endocrine system
Main Role	Maturation of T-cells (immune defense)

🧬 Functions of the Thymus

T-cell Maturation
- Immature white blood cells from bone marrow migrate to the thymus and mature into T-cells.
- These T-cells are critical for identifying and destroying infected or abnormal cells.
Self-tolerance Training
- The thymus “trains” T-cells to recognize self vs non-self, preventing autoimmune diseases.
Hormone Production
- Produces thymosin, thymopoietin, and other peptides that help T-cell development.

🔄 Life Cycle of the Thymus

Age Stage	Description
Childhood	Very active, large in size, produces many T-cells
Adolescence	Begins to shrink (called involution)
Adulthood	Largely replaced by fat, but still somewhat active

⚠️ Disorders of the Thymus

Disorder	Description
DiGeorge Syndrome	Congenital absence or underdevelopment of thymus
Myasthenia Gravis	Autoimmune disease often linked to thymus abnormality
Thymoma/Thymic cancer	Tumors originating from thymus tissue

🛡️ Role in Immunity

Cell Type	Role
Helper T-cells (CD4+)	Activate other immune cells
Cytotoxic T-cells (CD8+)	Destroy virus-infected or cancer cells
Regulatory T-cells	Prevent overactive immune response (autoimmunity)

🧘 Symbolism and Yogic Connection

Linked to the Anahata (Heart) Chakra, associated with love, compassion, and healing.
Practices like heart-opening yoga postures, deep breathing, and meditation may support thymus health energetically.

Summary Table

Gland	Main Role	Hormones	System
Thymus	T-cell development (immunity)	Thymosin, etc.	Immune/Endocrine

Would you like to explore how the immune system works with the thymus, or a visual comparing it with glands like the thyroid and pancreas?

Adrenal gland-

The adrenal glands (also known as suprarenal glands) are endocrine glands that produce a variety of hormones including adrenaline and the steroids aldosterone and cortisol. They are found above the kidneys. Each gland has an outer cortex which produces steroid hormones and an inner medulla.

Aldosterone helps control your blood pressure by managing the balance of potassium and sodium in your body. Cortisol works in conjunction with adrenaline and noradrenaline to help regulate your reaction to stress. Cortisol also helps regulate your metabolism, sugar levels, and blood pressure.

The adrenal glands are small, triangular-shaped endocrine glands located on top of each kidney. They are vital for producing hormones that regulate stress response, metabolism, blood pressure, and salt balance.

🧠 Basic Overview

Feature	Description
Location	On top of each kidney
Shape	Triangular or crescent-shaped
Parts	Outer cortex, inner medulla
Function	Hormone production (stress, metabolism, salt)

🧬 Two Main Parts & Their Functions

✅ 1. Adrenal Cortex (outer layer)

Produces steroid hormones, regulated by the pituitary gland (via ACTH).

Hormone Group	Example Hormones	Function
Glucocorticoids	Cortisol	Regulates metabolism, reduces inflammation, handles stress
Mineralocorticoids	Aldosterone	Controls blood pressure by managing salt and water balance
Androgens	DHEA (mild sex hormones)	Supports puberty and sex hormone production

✅ 2. Adrenal Medulla (inner part)

Part of the sympathetic nervous system – produces catecholamines in response to stress.

Hormone	Function
Adrenaline (Epinephrine)	Increases heart rate, breathing, energy – “fight or flight”
Noradrenaline (Norepinephrine)	Constricts blood vessels, raises blood pressure

🧪 Hormonal Summary

Hormone	Source	Main Action
Cortisol	Adrenal cortex	Stress regulation, metabolism, immune control
Aldosterone	Adrenal cortex	Salt and water balance, blood pressure
Adrenaline	Adrenal medulla	Acute stress response (fight or flight)
DHEA	Adrenal cortex	Mild sex hormone precursor

⚠️ Disorders of the Adrenal Glands

Disorder	Description
Addison’s disease	Adrenal insufficiency – low cortisol and aldosterone
Cushing’s syndrome	Excess cortisol – leads to weight gain, high BP, diabetes
Pheochromocytoma	Tumor in adrenal medulla causing too much adrenaline
Congenital Adrenal Hyperplasia	Genetic disorder affecting cortisol/aldosterone production

🧘 Yogic & Energetic View

Often associated with the Root Chakra (Muladhara) and Solar Plexus Chakra (Manipura).
Practices that reduce stress—like meditation, pranayama, grounding postures—help calm adrenal overactivity (especially in chronic stress).

🌿 Lifestyle Tips for Adrenal Health

Manage stress (avoid chronic overstimulation)
Sleep well and maintain regular routines
Eat a balanced diet with whole foods
Avoid excessive caffeine and sugar
Practice yoga, meditation, and breathing exercises

Summary Table

Gland	Key Hormones	Function
Adrenal Cortex	Cortisol, Aldosterone, Androgens	Metabolism, BP, stress, mild sex hormones
Adrenal Medulla	Adrenaline, Noradrenaline	Acute stress (“fight or flight”) response

Would you like a diagram showing the adrenal gland location and structure, or guidance on how to manage adrenal fatigue through yoga and lifestyle?

Testes-

The main hormone secreted by the testes is testosterone, an androgenic hormone. Testosterone is secreted by cells that lie between the seminiferous tubules, known as the Leydig cells.

The testes (singular: testis) are the male reproductive glands responsible for producing sperm and testosterone, the primary male sex hormone. They are vital for male fertility, sexual development, and the expression of secondary sexual characteristics.

🧠 Basic Overview

Feature	Description
Location	In the scrotum, outside the body cavity
Number	Two (left and right testis)
Size	About 4–5 cm in length
System	Reproductive + Endocrine
Main Functions	Sperm production, testosterone secretion

🔬 Main Functions

✅ 1. Spermatogenesis (sperm production)

Occurs in seminiferous tubules inside the testes.
Controlled by FSH (Follicle-Stimulating Hormone) and testosterone.
Requires a slightly lower temperature than body temperature (why testes are outside the body).

✅ 2. Testosterone Production

Produced by Leydig cells (also called interstitial cells) in response to LH (Luteinizing Hormone).
Testosterone is responsible for:

Role	Examples
Puberty	Voice deepening, facial hair, growth
Reproductive function	Sperm production, libido
Secondary sexual characteristics	Muscle mass, bone density, aggression

🧪 Hormonal Control

Hormone	Source	Function
LH	Pituitary gland	Stimulates Leydig cells → testosterone
FSH	Pituitary gland	Stimulates sperm production
Testosterone	Testes	Develops male traits, supports sperm

⚠️ Common Disorders

Disorder	Description
Hypogonadism	Low testosterone production
Testicular torsion	Twisting of spermatic cord – medical emergency
Varicocele	Enlarged veins in the scrotum – may affect fertility
Cryptorchidism	Undescended testes at birth
Testicular cancer	Most common in young men (15–35 years)
Infertility	Often linked to low sperm count or quality

🧘 Energetic & Yogic View

Associated with Muladhara Chakra (Root Chakra), governing vitality, grounding, and reproductive energy.
Yoga practices that balance this chakra may help regulate reproductive energy, especially Mula Bandha, Ashwini Mudra, and grounding postures.

🥗 Health Tips for Testes

Avoid overheating (tight clothing, laptops on lap)
Eat zinc-rich foods (pumpkin seeds, nuts)
Exercise regularly but avoid overtraining
Limit exposure to toxins, smoking, and alcohol
Regular self-examination for lumps or changes

Summary Table

Function	Area	Regulated By
Sperm production	Seminiferous tubules	FSH + Testosterone
Hormone production	Leydig cells	LH
Main hormone	Testosterone	Masculine traits, fertility

Would you like a comparison of the testes and ovaries, or guidance on improving male reproductive health naturally?

Ovary-

The ovary is an organ found in the female reproductive system that produces an ovum. When released, this travels down the fallopian tube into the uterus, where it may become fertilized by a sperm. There is an ovary (from Latin ovarium ‘egg, nut’) found on each side of the body.

The ovaries are the female reproductive glands responsible for producing eggs (ova) and the female sex hormones estrogen and progesterone. They play a crucial role in menstruation, fertility, and sexual development.

🧠 Basic Overview

Feature	Description
Location	Lower abdomen, on either side of the uterus
Number	Two (left and right ovary)
Size	About the size of an almond
System	Reproductive + Endocrine
Main Functions	Egg release (ovulation) and hormone secretion

🔬 Main Functions

✅ 1. Oogenesis (Egg Production)

Begins before birth but matures during puberty.
Each month, one mature egg is released during ovulation.
Controlled by FSH and LH from the pituitary gland.

✅ 2. Hormone Secretion

Ovaries secrete:

Hormone	Function
Estrogen	Develops female traits, regulates menstrual cycle
Progesterone	Prepares uterus for pregnancy, supports early pregnancy
Inhibin	Inhibits FSH to regulate cycle

📅 Menstrual Cycle and Ovarian Phases

Phase	Key Activity	Hormone Involved
Follicular phase	Egg matures in ovary	FSH, Estrogen
Ovulation	Mature egg released into fallopian tube	LH surge
Luteal phase	Hormones prepare uterus for implantation	Progesterone
If no pregnancy	Hormone levels drop → menstruation	↓ Estrogen & Progesterone

⚠️ Common Disorders

Condition	Description
Polycystic Ovary Syndrome (PCOS)	Hormonal imbalance, cysts, irregular periods
Ovarian cysts	Fluid-filled sacs – often harmless
Ovarian cancer	Often detected late, symptoms can be vague
Premature ovarian failure	Early loss of function before age 40
Endometriosis	Tissue similar to uterine lining grows outside uterus

🧘 Yogic & Energetic View

Ovaries are associated with the Svadhisthana Chakra (Sacral Chakra), governing creativity, emotion, and reproduction.
Helpful yoga practices include hip openers, moon salutations, and balancing pranayama like Nadi Shodhana.

🥗 Health Tips for Ovary Wellness

Maintain healthy weight and balanced hormones
Eat foods rich in omega-3s, zinc, folate, and fiber
Reduce stress through yoga and meditation
Regular gynecological check-ups
Limit intake of processed foods and endocrine disruptors (like plastics, pesticides)

Summary Table

Function	Hormones	Regulated By
Egg production	—	FSH, LH
Hormone secretion	Estrogen, Progesterone	Hypothalamus + Pituitary
Cycle regulation	Estrogen, Progesterone	Menstrual cycle

Would you like a diagram comparing ovaries and testes, or a guide on hormone-balancing foods and yoga practices for ovarian health?

Human Body

Home

Body…

————–

Body is made of many systems:-

Organ system of human body: It consist of various internal organs and external organs.
Skeletal system of human body- It consist of Axial Skeleton and Appendicular Skeleton.
Muscle system of human body-It consist of Smooth muscles, Skeletal muscles and cardiac muscles.
Endocrine system of human body.
Nervous system of human body.
Digestive system of human body.
Circulatory system
system of human body.

Let’s learn various internal organs of organ system…

HUMAN BODY INTERNAL ORGANS
1. Brain
2. Heart (Detailed)
3. Lungs
4. Kidney
5. Pancreas
6. Liver
7. Stomach
8. Intestines
9. Pituitary gland
10. Blood

Detailed notes on blood
11. Skin
12. Muscle
13. Hair teeth and nails

14. Unit of Life- Cell

20.Cholinergic activity

21.Cortex and Medulla

22.Body Functions

Let’s learn one by one.

HUMAN BODY INTERNAL ORGANS

Brain…

————

Brain has two Sides.

Left part of brain control right side and right part of brain control left side.

Parts of brain …

——–

1. Cerebrum—-

Largest part of brain. Made up of cerebral cortex and cerebral medulla called white part and grey part of cerebral muscle. There are various folds and convolution in cerebral muscle.

Function of cerebrum is thinking, making desicions.

2. Cerebellum—-

Starting part of central nervous system .

This is second largest part of brain. It is located behind the cerebrum. Job of cerebellum is control involuntary actions. Function of motor nerves.

It is called little brain. Located in hind part of brain.

Maintain posture and balance.

3. Medulla Oblangatta—-

Helps in control and co-ordination of body.

Functional unit of reflex action.

Looks like a flower , it is located in the base of brain.

It connects brain stem to spinal cord. Cardiovascular and respiration controller.

4. Pineal gland …

Pineal gland is located Just between the eye brows in middle of cerebral knobs. It secrets a juice called Melanie responsible for indusing sleep. It is very small, 2 to 3 inches in size.

5. Pituitary gland…

This is the master of all glands of the body. It is called master gland. It basically doesn’t secrete any juice but gives instructions to thyroid gland and various endocrine glands like liver and pancreas.

HUMAN BODY INTERNAL ORGANS

Heart…

————-
Heart has four chambers.

Left Artria

Right Ventricle

Left Artria

Left Ventricle

1. Artaries are blood vessels that carry impure blood , de-oxigenated blood.

2. Veins are blood vessels that carry oxygenated blood, pure blood.

3. Pulmonary artery carries de-oxigenated blood to Lungs for Purification.

4. Pulmonary vein carries oxygenated blood to heart.

5. Superior vinacava carries oxygenated blood to upper part of body.

6. Inferior vinacava carries oxygenated blood to lower part of body.

7. Aorta is the Largest blood vessels in the body.

Aorta carries pure blood from left ventricle and supply to all parts of neck and arms.

Aorta also carries oxygenated blood supply throughout the body.

It also carries blood to Kidneys for oxygenated blood is required for filteration.

Aorta is the only artary that carries oxygenated blood.

Left coronary artery

Right coronary artery

Left coronary vein

Right coronary vein

Are the four blood vessels, of which, artaries carry de-oxigenated blood from hearts left and right chambers to lungs.

Veins carry oxygenated blood to both left and right side of heart from lungs.

72 heartbeats occur in one minute .

Blood capacity of heart is 5 liters.

Cystolic Blood pressure is 80/120 mm .

HUMAN BODY INTERNAL ORGANS

Lungs…

—————-
Lungs are the organs responsible for breathing.

1.Trachea

Trachea are single tubular structure that are covered by cartialegenus muscle. They send air to lungs from nose.

When air enters from nose, through trachea it enters lungs.

Lungs have three lobes in right side and two lobes in left side. Because pancreas are attached to left side.

2. Bronchus

Trachea branches to Bronchus . Bronchus branch to bronchitis.

3.Alveioli

Bronchitis gets attached to small circular structure called alveioli.

There are artaries and veins dividing into capillary in the border areas of lungs.

These veins have pure oxygenated blood and artaries have de-oxigenated blood.

When air enters alveioli. Blood cells transfer oxygen to them in veins. Artaries supply carbon dioxide into alveioli . We exhale this carbon dioxide through nose .

How does breathing take place?

Lungs are like sponge which remain contracted, this low pressure tends to supply air from outside through nose to lungs. Expanded lungs help blood to extract oxygen to blood cells and expel carbon dioxide outside.

What is respiration?

There are Four types of respiration.

1. BREATHING or ventilation.

2. EXTERNAL RESPIRATION, which is the exchange of gases (oxygen and carbon dioxide) between inhaled air and the blood.

3. INTERNAL RESPIRATION, which is the exchange of gases between the blood and tissue fluids.

4. CELLULAR RESPIRATION.

Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert chemical energy from oxygen molecules or nutrients into adenosine triphosphate (ATP), and then release waste products.

Lung capacity is 6 liters in adults.

HUMAN BODY INTERNAL ORGANS

Kidney…

—————–

Kidney are two bean shaped organs that are connected to urinary bladder.

This kidney function is filtering blood.

1.Nephron…

Nephrons are building-blocks of Kidney.

In stomach, food gets dijested , food is converted to ATP, various unwanted salts and sugar and nitrogenous waste are moved from blood by nephrons.

2. Glomerulas

Nephron have a Bowman’s capsule which is in contact with, glomerulas. Glomerulas is a bunch of blood vessels that carry unwanted salts. Aferrent tubules carry blood into Bowman’s capsule and Eferrent tubules carry filtered blood outside Bowman’s capsule.

Structure of Nephron:- Bowman’s capsule , upper convolution tube, Henrys loop, lower convulsion tube.

3. Bowman’s capsule

Bowman’s capsule is a bowl like structure that stores waste salts and ions from afferent blood vessels.

Salt from glomerulas is separated into Bowman’s capsule and upper convolution tube carries to Henrys loop where again unwanted ions are separated and moved to lower convolution tube leading to Calix and to Urinary tract into urinary bladder and to urethra thereby passing out the urine when smooth muscle in urethra are expanded.

HUMAN BODY INTERNAL ORGANS

Pancreas…

————————-

Pancreas are seen attached to lower part of Stomach.

Job of pancreas is making digestive juices for easy digestion.

Pancreas is a Endocrine cum Exocrine gland. Meaning, it directly passes hormones into blood as well as into digestive system.

Pancreas release alpha cells, beta cells, delta cells, and f-cells.

Endocrine hormones secreted by Pancreas are

1. Insulin
2. Glycogen

——-

Exocrine hormones secreted by Pancreas are:-

1. ChimeTrypsinogen-
chimotripsin and

2. Trypsinogen-
tripsin are for Protine digestion.

3.Amylase for carbohydrate digestion

4. Lypase for fat digestion

Brush border enzymes-

—-
1.GlucoDexteramylase
2.Maltase
3.Sucrase
4.Lactase

Natural insulin (i.e. insulin released from your pancreas) keeps your blood sugar in a very narrow range. Overnight and between meals, the normal, non-diabetic blood sugar ranges between 60-100mg/dl and 140 mg/dl or less after meals and snacks.

HUMAN BODY INTERNAL ORGANS

Liver…

————–

Liver has four lobes. Right lobe, left lobe, coudate lobe and inferior lobe. Liver is an exocrine gland.

Means hormons or enzymes secreted by liver are not secreted to blood but Bile is secreted into intestine.

Bile is essentially a lubricant and dijestive fluid. Liver is also an endocrine gland and a blood filter.

Liver is the biggest gland in human body.

HUMAN BODY INTERNAL ORGANS

Stomach…

————————

Stomach is a bag like structure attached to the food duct esophagus.

The width:lehgth:height is 6:12:6 inches.

Stomach can hold maximum of 2 to 4 liters.

New born can hold only 30ml of milk.
The stomach is a muscular sac located on the left side of the upper abdomen. The stomach receives food from the esophagus. As food reaches the end of the esophagus, it enters the stomach through a muscular valve called the lower esophageal sphincter. The stomach secretes acid and enzymes that digest food.

HUMAN BODY INTERNAL ORGANS

Intestine…

————————-
There are two intestine. Small intestine and Large intestine.

Small intestine-

………………………..

Small intestine is folded into pallates and grooves. Small intestine is the continuition of stomach. The point of continuition is called intestinal spincher.

Small intestine
5 m long 1 inch width
Parts of small intestine
1.Deodenum
2.Jejunum
3.Illium

Uses various enzymes from liver pancreas and Gallbladder .

Enzymes like Bile from Liver.

Glycotripsin, tripsin, lypase, maltase, amylase from Pancreas.

These enzymes are secreted directly into Deodenum of small intestine.

Large intestine-

………………………..

Large intestine is divided into five.

1.Ceacum
2.Ascending column
3.Transverse column
4.Desending column
5.Rectum

Large intestine is 2 m long and large diameter.

Peristalsis happens contraction of the large intestines for moving forward undigested waste food.

Food is stored in rectum until the waste is expelled outside the body through annus.

HUMAN BODY INTERNAL ORGANS

Pituitary gland…

Anterior pituitary:-

Somatotrope-somatostanin
Corticotrope-corticotroposin
Thyrotrope-Thyrotropsin
Gonadotrope- Leiutanizing hormone and Follicle stimulating hormone
Lactotrope- Prolatin

Intermediate pituitary:-

Melanin stimulating hormone

Posterior pituitary:-

Antidiuretic hormone or Vassopressin
Oxytocin

Uses:-

Growth
Urin contraction
Child birth
Breast feeding
Sex hormone
Metabolism
Osmoregulation
Thyroid
Temperature
Pain relief

HUMAN BODY INTERNAL ORGANS

Blood…

A blood cell, also called a hematopoietic cell, hemocyte, or hematocyte, is a cell produced through hematopoiesis and found mainly in the blood. Major types of blood cells include red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes).

Blood cells. Blood contains many types of cells: white blood cells (monocytes, lymphocytes, neutrophils, eosinophils, basophils, and macrophages), red blood cells (erythrocytes), and platelets. Blood circulates through the body in the arteries and veins.

A, B, AB, O each Rh+, and Rh-, total 8 group s

——————————————————————————————-

Erythrocytes

1. What is the erythrocytes? What is its role?

Red blood cells, also known as erythrocytes, deliver oxygen to the tissues in your body. Oxygen turns into energy and your tissues release carbon dioxide. Your red blood cells also transport carbon dioxide to your lungs for you to exhale.

2. What does it mean when erythrocytes are high? or

What is a high red blood cell count?

A high red blood cell count is a condition called polycythemia vera. If you have this medical condition, it means that your bone marrow is producing too many red blood cells. This can result in thickening of the blood, slow flow of blood, and eventually blood clots.

Polycythemia vera (pol-e-sy-THEE-me-uh VEER-uh) is a type of blood cancer. It causes your bone marrow to make too many red blood cells. These excess cells thicken your blood, slowing its flow, which may cause serious problems, such as blood clots. Polycythemia vera is rare.

A high RBC count may be a result of sleep apnea, pulmonary fibrosis, and other conditions that cause low oxygen levels in the blood. Performance-enhancing drugs like protein injections and anabolic steroids can also increase RBCs. Kidney disease and kidney cancers can lead to high RBC counts as well.

3. What does it mean when erythrocytes are low?

A low RBC count could also indicate a vitamin B6, B12 or folate deficiency. It may also signify internal bleeding, kidney disease or malnutrition (where a person’s diet doesn’t contain enough nutrients to meet their body’s needs).

4. What is the Lifespan of erythrocytes?

The lifespan of a red blood cell is around 120 days.

———————————————————————————————-

Leukocytes

What happens if leukocytes are high?

Higher levels of leukocytes in the bloodstream may indicate an infection. This is because WBCs are part of the immune system, and they help fight off disease and infection. Leukocytes may also be found in a urinalysis, or a urine test. High levels of WBCs in your urine also suggest that you have an infection.

What happens if leucocytes are low?

A low WBC count can be serious because it increases your risk of developing a potentially life-threatening infection. Seek prompt medical care if you have a low WBC count and have signs of an infection, such as a fever, swollen lymph nodes, sore throat, or skin lesions.

There are 6 types of Leucocytes.

———————————————————————————————–

What are the Lifespans 6 types of white blood cells and their counts?

Monocytes. They have a longer lifespan than many white blood cells and help to break down bacteria.

Life span:- Normally, circulating monocytes are short-lived and undergo spontaneous apoptosis on a daily basis. Macrophages, however, have a longer life span. The lifespan varies with the “lesion” and “tissue”. In general, tissue resident macrophages are long-lived cells – from more than 3-days to weeks. Again, the life span varies with species. Unlike neutrophils, which are short-lived, macrophages can live for months to years.

High count of Monocytes. A high monocyte count — also called monocytosis — is often associated with chronic or sub-acute infections. It can also be linked with some types of cancer, especially leukemia. A high monocyte count can occur when you are recovering from an acute infection.

Low levels of monocytes tend to develop as a result of medical conditions that lower your overall white blood cell count or treatments for cancer and other serious diseases that suppress the immune system. Causes of low absolute monocyte count include: chemotherapy and radiation therapy, which can injure bone marrow.

————————————————————————————————Lymphocytes. They create antibodies to fight against bacteria, viruses, and other potentially harmful invaders.

High count of Lymphocytes. High lymphocyte blood levels indicate your body is dealing with an infection or other inflammatory condition. Most often, a temporarily high lymphocyte count is a normal effect of your body’s immune system working. Sometimes, lymphocyte levels are elevated because of a serious condition, like leukemia.

LOW COUNT OF LYMPHOCYTES. Lymphocytopenia, also referred to as lymphopenia, occurs when your lymphocyte count in your bloodstream is lower than normal. Severe or chronic low counts can indicate a possible infection or other signficant illness and should be investigated by your doctor. Lymphocytes are a kind of white blood cell.

LIFE SPAN OF LYMPHOCYTES. Types and functions of lymphocytes. Most lymphocytes are short-lived, with an average life span of a week to a few months, but a few live for years, providing a pool of long-lived T and B cells. These cells account for immunologic “memory,” a more rapid, vigorous response to a second encounter with the same antigen.

———————————————————————————————–Neutrophils. They kill and digest bacteria and fungi.

High count of Neutrophils. Having a high percentage of neutrophils in your blood is called neutrophilia. This is a sign that your body has an infection. Neutrophilia can point to a number of underlying conditions and factors, including: infection, most likely bacterial.

LOW COUNT OF NEUTROPHILS. When the body has too few neutrophils, the condition is called neutropenia. This makes it harder for the body to fight off pathogens. As a result, the person is more likely to get sick from infections. In general, an adult who has fewer than 1,000 neutrophils in a microliter of blood has neutropenia.

LIFE SPAN OF NEUTROPHILS. Neutrophils are short-lived cells; their life span from stem cell to removal in the tissues is 12 to 14 days.

———————————————————————————————–Basophils. basophils are responsible for fighting fungal or bacterial infections and viruses. They are a granulocyte cell, which means that they release granules of enzymes to fight against harmful bacteria and germs.

High Count of Basophils. A high count of basophils is called basophilia. This can be caused by hypothyroidism, a condition which occurs when the thyroid gland doesn’t produce enough thyroid hormone. If thyroid hormone is low, it can cause bodily functions to slow down.

LOW COUNT OF BASOPHILS. Often, a low basophils count is related to an allergic reaction which is putting the basophils into overdrive. In these cases, symptoms will include watery eyes, a runny nose, red rash and hives. However, a basophil low can also be caused by a severe allergic anaphylactic reaction.

LIFE SPAN OF BASOPHILS. They are generated from the granulocyte–monocyte progenitors in the bone marrow and populate the periphery as fully mature cells. The lifespan of basophils is short; recently estimated to be in the range of 1–2 days.

———————————————————————————————–Eosinophils. Eosinophils are a type of disease-fighting white blood cell. This condition most often indicates a parasitic infection, an allergic reaction or cancer. You can have high levels of eosinophils in your blood (blood eosinophilia) or in tissues at the site of an infection or inflammation (tissue eosinophilia).

High Count of Eosinophils. A high count could also be caused by an allergic disorder such as asthma, eczema, hay fever, or allergies to substances or certain medications. High eosinophil count can indicate certain autoimmune disorders, Cushing’s disease (a condition caused by heightened cortisol levels), or blood disorders such as leukemia.

LOW COUNT OF EOSIONOPHILS. Low eosinophil counts may also be due to the time of day. Under normal conditions, eosinophil counts are lowest in the morning and highest in the evening. Unless alcohol abuse or Cushing’s disease is suspected, low levels of eosinophils are not usually of concern unless other white cell counts are also abnormally low. As normal levels of eosinophils can be zero, a low level of eosinophils isn’t usually considered a medical problem after one test. However, there are some conditions that can cause a low level of eosinophils, which is known as eosinopenia. An example of this is drunkenness.

LOW SPAN OF EOSIONOPHILS. The tissue life span of eosinophils ranges from 2 to 5 days, depending partly on the tissue studied. However, cytokines increase eosinophil survival in vitro to 14 days or longer; thus, they likely also prolong eosinophil survival in vivo.

————————————————————————————————

Macrophages. Macrophages are specialised cells involved in the detection, phagocytosis and destruction of bacteria and other harmful organisms. In addition, they can also present antigens to T cells and initiate inflammation by releasing molecules (known as cytokines) that activate other cells.

Kupffer cells: Liver

Alveolar macrophage: Lung alveoli

Type of macrophage: Location

Microglia: Central nervous system

What Does a High Monocyte Count Mean?

A high monocyte count — also called monocytosis — is often associated with chronic or sub-acute infections. It can also be linked with some types of cancer, especially leukemia. A high monocyte count can occur when you are recovering from an acute infection.

Low absolute monocyte count.

Low levels of monocytes tend to develop as a result of medical conditions that lower your overall white blood cell count or treatments for cancer and other serious diseases that suppress the immune system.

Life span of Microphages.

The lifespan varies with the “lesion” and “tissue”. In general, tissue resident macrophages are long-lived cells – from more than 3-days to weeks. Again, the life span varies with species. Unlike neutrophils, which are short-lived, macrophages can live for months to years.

Why are macrophages long-lived?

Macrophages are specialised immune cells that destroy bacteria and other harmful organisms. Most importantly, these long-lived macrophages are vital for the survival of the nerve cells of the gastrointestinal tract. This sheds new light on neurodegenerative conditions of the intestine, but also of the brain.

———————————————————————————————–

Thrombocytes or Platelets

Thrombocytes are pieces of very large cells in the bone marrow called megakaryocytes.

They help form blood clots to slow or stop bleeding and to help wounds heal.

Having too many or too few thrombocytes or having platelets that don’t work as they should can cause problems.

LIFE SPAN OF THROMBOCYTES. The blood cells whose function is to prevent bleeding are platelets and they are also called thrombocytes. The average lifespan of the circulating platelets is around 7 to 10 days.

LIFE SPAN OF ERYTHROCYTES.

Erythrocytes and platelets both begin their lives as hematocytoblasts, or stem cells, within the bone marrow.

This is why erythrocytes only have a lifespan of 120 days, while platelets only live for about ten days.

———————————————————————————————-

HUMAN BODY INTERNAL ORGANS

SKIN

The human skin is the outer covering of the body and is the largest organ of the integumentary system. The skin has up to seven layers of ectodermal tissue and guards the underlying muscles, bones, ligaments and internal organs. … Though nearly all human skin is covered with hair follicles, it can appear hairless.

What are the 7 layers of skin?What are the seven most important layers of your skin?

Stratum corneum. The stratum corneum is the outer layer of the skin (epidermis). It serves as the primary barrier between the body and the environment. … stratum corneum: the outermost layer of skin, made up of layers of very resilient and specialized skin cells and keratin.

Stratum lucidum. The stratum lucidum (Latin for “clear layer”) is a thin, clear layer of dead skin cells in the epidermis named for its translucent appearance under a microscope. It is readily visible by light microscopy only in areas of thick skin, which are found on the palms of the hands and the soles of the feet.

Stratum granulosum. The stratum granulosum (or granular layer) is a thin layer of cells in the epidermis lying above the stratum spinosum and below the stratum corneum (stratum lucidum on the soles and palms). Keratinocytes migrating from the underlying stratum spinosum become known as granular cells in this layer.

Stratum spinosum. The stratum spinosum (or spinous layer/prickle cell layer) is a layer of the epidermis found between the stratum granulosum and stratum basale. This layer is composed of polyhedral keratinocytes. These are joined together with desmosomes. … The stratum spinosum also contains Langerhans cells.

Stratum basale. The stratum basale (basal layer, sometimes referred to as stratum germinativum) is the deepest layer of the five layers of the epidermis, the external covering of skin in mammals. The stratum basale is a single layer of columnar or cuboidal basal cells. … The nucleus is large, ovoid and occupies most of the cell.

Dermis. (DER-mis) The inner layer of the two main layers of the skin. The dermis has connective tissue, blood vessels, oil and sweat glands, nerves, hair follicles, and other structures. It is made up of a thin upper layer called the papillary dermis, and a thick lower layer called the reticular dermis.

Hypodermis. The hypodermis is the bottom layer of skin in your body. It has many important functions, including storing energy, connecting the dermis layer of your skin to your muscles and bones, insulating your body and protecting your body from harm. As you age, your hypodermis decreases in size, and your skin starts to sag.

Epidermis. Your epidermis is the top layer of the skin that you can see and touch. Keratin, a protein inside skin cells, makes up the skin cells and, along with other proteins, sticks together to form this layer.

1.What are the 3 major epidermis made up of?

keratinocytes. Three main populations of cells reside in the epidermis: keratinocytes, melanocytes, and Langerhans cells.

The cutaneous membrane is the technical term for our skin. … Our skin is made of three general layers. In order from most superficial to deepest they are the epidermis, dermis, and subcutaneous tissue.

2.What does Skin secrete?

Skin secretions originate from glands that in dermal layer of the epidermis. Sweat, a physiological aid to body temperature regulation, is secreted by eccrine glands. Sebaceous glands secrete the skin lubricant sebum. Sebum is secreted onto the hair shaft and it prevents the hair from splitting.

3.What is the deepest layer of the skin?

hypodermis.

The hypodermis is deep to the dermis and is also called subcutaneous fascia. It is the deepest layer of skin and contains adipose lobules along with some skin appendages like the hair follicles, sensory neurons, and blood vessels.

4.What are the functions of Skin?

The skin performs six primary functions which include, protection, absorption, excretion, secretion, regulation and sensation. The skin functions as our first line of defense against toxins, radiation and harmful pollutants.

Your skin is the organ that comes into contact with the rest of the world. It holds body fluids in, preventing dehydration (dee-hahy-DREY-shun), and keeps harmful microbes (MYE-krobs) out—without it, we would get infections. Your skin is full of nerve endings that help you feel things like heat, cold, and pain.

5.What gives skin its color?

Your skin gets its color from a pigment called melanin. Special cells in the skin make melanin. When these cells become damaged or unhealthy, it affects melanin production. Some pigmentation disorders affect just patches of skin.

HUMAN BODY INTERNAL ORGANS

——————————————————————————————

MUSCLE

Muscle is contractile tissue grouped into coordinated systems for greater efficiency. In humans the muscle systems are classified by gross appearance and location of cells. The three types of muscles are striated (or skeletal), cardiac, and smooth (or nonstriated).

striated (or skeletal)

Unlike smooth muscle and cardiac muscle, skeletal muscle is under voluntary control. … Similar to cardiac muscle, however, skeletal muscle is striated; its long, thin, multinucleated fibres are crossed with a regular pattern of fine red and white lines, giving the muscle a distinctive appearance.

cardiac muscle

Cardiac muscle (also called heart muscle or myocardium) is one of three types of vertebrate muscle tissue, with the other two being skeletal muscle and smooth muscle. It is involuntary, striated muscle that constitutes the main tissue of the wall of the heart.

smooth (or nonstriated)

Smooth muscle is non-striated, although it contains the same myofilaments they are just organized differently, and involuntary. … Muscle Types: Cardiac and skeletal muscle are both striated in appearance, while smooth muscle is not. Both cardiac and smooth muscle are involuntary while skeletal muscle is voluntary.

What are Myofibrils?

myofibril, very fine contractile fibres, groups of which extend in parallel columns along the length of striated muscle fibres. The myofibrils are made up of thick and thin myofilaments, which help give the muscle its striped appearance.

HUMAN BODY INTERNAL ORGANS

———————————————————————————————

hair teeth and nails

1. What do hair teeth and nails have in common?

Incisors, hair follicles and nails share a common tissue origin as ectodermal derivatives, and they undergo similar morphogenetic programs. These developmental parallels likely account for some of the similarities in their SC niches.

2. What are 4 types of SC niches?

Hematopoietic stem cell niche.

Hair follicle stem cell niche.

Intestinal stem cell niche.

Cardiovascular stem cell niche.

3.What is morphogenesis?

Morphogenesis is the biological process that causes a cell, tissue or organism to develop … programs according to the spatial patterning of cells within tissues.

In the developmental biology of the early twentieth century, a morphogenetic field is a group of cells able to respond to discrete, localized biochemical

4.What are morphogenetic movements?

The movement of cells in the early embryo that change the shape or form of differentiating cells and tissues.

5.Are hair nails and teeth made of the same thing?

Hair and Fingernails – Like hair and fingernails, tooth enamel contains keratin, but in significantly less levels, teeth are not considered the same makeup as hair or fingernails.

6.Which vitamin is good for hair and teeth?

Vitamin D is doubly important because not only does it boost mineral density, it also helps absorb, carry, and deposit calcium in the bones that support your teeth. Some dairy products and cereal are fortified with vitamin D, but you can also get it naturally from the sun.

The vertebrate ectoderm gives rise to organs that produce mineralized or keratinized substances, including teeth, hair, and claws. Most of these ectodermal derivatives grow continuously throughout the animal’s life and have active pools of adult stem cells that generate all the necessary cell types. These organs provide powerful systems for understanding the mechanisms that enable stem cells to regenerate or renew ectodermally derived tissues, and remarkable progress in our understanding of these systems has been made in recent years using mouse models. We briefly compare what is known about stem cells and their niches in incisors, hair follicles, and claws, and we examine expression of Gli1 as a potential example of a shared stem cell marker. We summarize some of the features, structures, and functions of the stem cell niches in these ectodermal derivatives; definition of the basic elements of the stem cell niches in these organs will provide guiding principles for identification and characterization of the niche in similar systems.

7. Why are hair and nails part of the integumentary system?

The integumentary system is made up of several organs and structures including the skin, hair, nails, glands, and nerves. The primary function of the integumentary system is to protect the inside of the body from elements in the environment—like bacteria, pollution, and UV rays from the sun.

———————————————————————————————

HUMAN BODY AND ORGAN SYSTEM

———————————————————————————————–

cell

A cell is the building blocks of all organisms, the smallest unit of a living thing. There are organisms made up of just one cell such as bacteria. And then organisms such as humans that have about 100 trillion cells!

What are the 4 types of cells?

The Four Main Types of Cells

Epithelial Cells. These cells are tightly attached to one another. …

Epithelial cells are a type of cell that lines the surfaces of your body. They are found on your skin, blood vessels, urinary tract, and organs. An epithelial cells in urine test looks at urine under a microscope to see if the number of your epithelial cells is in the normal range.

The most common cause of epithelial cells in urine is improper urine sample collection. Your doctor may, therefore, ask you to take another urine test. The presence of epithelial cells in urine may indicate infections, kidney disease, or (very rarely) a serious illness such as a tumor.

They perform a variety of functions that include protection, secretion, absorption, excretion, filtration, diffusion, and sensory reception. The cells in epithelial tissue are tightly packed together with very little intercellular matrix.

There are three principal shapes of epithelial cell: squamous, columnar, and cuboidal.

Where Are Epithelial Cells Found? Epithelial cells line the major cavities of the body. Epithelia form the structure of the lung, including the alveoli or air sacs where gas exhange occurs. Cells line most organs, such as the stomach and small intestine, kidney, and pancreas.

Is an epithelial cell a skin cell?Even if you think your skin is one smooth surface, it is actually made of millions of epithelial cells that are tightly packed next to each other. That’s not the only place you find these cells. Epithelial cells also line the inside of your throat, intestines, blood vessels, and all your organs.

Nerve Cells. These cells are specialized for communication. …

Each nerve cell consists of the cell body, which includes the nucleus, a major branching fiber (axon) and numerous smaller branching fibers (dendrites). … The myelin sheath is fatty material that covers, insulates and protects nerves of the brain and spinal cord.

Nerve cells (neurones) are ‘excitable’ cells which can transduce a variety of stimuli into electrical signals, continuously sending information about the external and internal environment (in the form of sequences of action potentials) to the central nervous system (CNS).

Neurons are the cells that make up the brain and the nervous system. … For the spinal cord though, we can say that there are three types of neurons: sensory, motor, and interneurons.

Sensory neurons are the nerve cells that are activated by sensory input from the environment – for example, when you touch a hot surface with your fingertips, the sensory neurons will be the ones firing and sending off signals to the rest of the nervous system about the information they have received. A sensory neuron transmits impulses from a receptor, such as those in the eye or ear, to a more central location in the nervous system, such as the spinal cord.

Motor neurons (MNs) are neuronal cells located in the central nervous system (CNS) controlling a variety of downstream targets. This function infers the existence of MN subtypes matching the identity of the targets they innervate. A motor neuron is a neuron whose cell body is located in the motor cortex, brainstem or the spinal cord, and whose axon (fiber) projects to the spinal cord.

Interneurons are the central nodes of neural circuits, enabling communication between sensory or motor neurons and the central nervous system (CNS). They play vital roles in reflexes, neuronal oscillations, and neurogenesis in the adult mammalian brain.

Based on shapes, neurons are classified into five types namely Unipolar neurons, Bipolar neurons, Pseudounipolar neurons, Anaxonic neurons, and Multipolar neurons.

A unipolar neuron is a neuron in which only one process, called a neurite, extends from the cell body. The neurite then branches to form dendritic and axonal processes. Most neurons in the central nervous systems of invertebrates, including insects, are unipolar. … The axon then splits into two branches. A bipolar neuron, or bipolar cell, is a type of neuron that has two extensions (one axon and one dendrite). Many bipolar cells are specialized sensory neurons for the transmission of sense. As such, they are part of the sensory pathways for smell, sight, taste, hearing, touch, balance and proprioception. A pseudounipolar neuron is a type of neuron which has one extension from its cell body. This type of neuron contains an axon that has split into two branches; one branch travels to the peripheral nervous system and the other to the central nervous system. An anaxonic neuron is a type of neuron where there is no axon or it cannot be differentiated from the dendrites. Being loyal to the etymology of anaxonic. A multipolar neuron is a type of neuron that possesses a single axon and many dendrites (and dendritic branches), allowing for the integration of a great deal of information from other neurons. These processes are projections from the neuron cell body. … Peripherally, multipolar neurons are found in autonomic ganglia.

Muscle Cells. These cells are specialized for contraction. …

What is in a muscle cell?The muscle cell is comprised of myofibrils, each consisting of repeated sections of sarcomeres. The cytoplasm of the muscle cell is called sarcoplasm. The smooth endoplasmic reticulum of the muscle cell is called sarcoplasmic reticulum. The plasma membrane of the muscle cell is termed sarcolemma.

Connective Tissue Cells.

The common cell types in connective tissue include: fibroblasts, mast cells, plasma cells, macrophages, adipocytes, and leukocytes.

Fibroblasts are the most common cell type of connective tissue. They produce both fibers and amorphous ground substance.

A fibroblast is a type of biological cell that synthesizes the extracellular matrix and collagen, produces the structural framework (stroma) for animal tissues, and plays a critical role in wound healing. Fibroblasts are the most common cells of connective tissue in animals.

mast cells– A mast cell (also known as a mastocyte or a labrocyte) is a resident cell of connective tissue that contains many granules rich in histamine and heparin. Specifically, it is a type of granulocyte derived from the myeloid stem cell that is a part of the immune and neuroimmune systems.

plasma cells- plasma cell, short-lived antibody-producing cell derived from a type of leukocyte (white blood cell) called a B cell. B cells differentiate into plasma cells that produce antibody molecules closely modeled after the receptors of the precursor B cell.

macrophages- Macrophages are specialised cells involved in the detection, phagocytosis and destruction of bacteria and other harmful organisms. In addition, they can also present antigens to T cells and initiate inflammation by releasing molecules (known as cytokines) that activate other cells.

adipocytes– Adipocytes, also known as lipocytes and fat cells, are the cells that primarily compose adipose tissue, specialized in storing energy as fat. … In cell culture, adipocytes can also form osteoblasts, myocytes and other cell types.

OSTEOBLASTS are the cells that form new bone. They also come from the bone marrow and are related to structural cells. They have only one nucleus. Osteoblasts work in teams to build bone. They produce new bone called “osteoid” which is made of bone collagen and other protein.

MYCOCYTES – Myocytes are contractile muscle cells that make up the heart muscle: • They include one to four nuclei per cell. • They have high mitochondrial organelle density within the cell that can produce ATP for energy.

leukocytes- Leukocytes are part of the body’s immune system. They help the body fight infection and other diseases. Types of leukocytes are granulocytes (neutrophils, eosinophils, and basophils), monocytes, and lymphocytes (T cells and B cells).

NEUTROPHILS- A type of white blood cell that is an important part of the immune system and helps the body fight infection. When microorganisms, such as bacteria or viruses, enter the body, neutrophils are one of the first immune cells to respond.

EOSINOPHILS- Eosinophils are a type of disease-fighting white blood cell. This condition most often indicates a parasitic infection, an allergic reaction or cancer. You can have high levels of eosinophils in your blood (blood eosinophilia) or in tissues at the site of an infection or inflammation (tissue eosinophilia).

BASOPHILS- Basophils are a type of white blood cell. Like most types of white blood cells, basophils are responsible for fighting fungal or bacterial infections and viruses. They are a granulocyte cell, which means that they release granules of enzymes to fight against harmful bacteria and germs.

MONOCYTE- A monocyte is a type of white blood cell and a type of phagocyte. Enlarge. Blood cells. Blood contains many types of cells: white blood cells (monocytes, lymphocytes, neutrophils, eosinophils, basophils, and macrophages), red blood cells (erythrocytes), and platelets.

LYMPHOCYTES- Lymphocytes are white blood cells and one of the body’s main types of immune cells. They are made in the bone marrow and found in the blood and lymph tissue. The immune system is a complex network of cells known as immune cells that include lymphocytes.

MACROPHAGES- Macrophages are specialised cells involved in the detection, phagocytosis and destruction of bacteria and other harmful organisms. In addition, they can also present antigens to T cells and initiate inflammation by releasing molecules (known as cytokines) that activate other cells.

ERYTHROCYTES- Red blood cells, also known as erythrocytes, deliver oxygen to the tissues in your body. Oxygen turns into energy and your tissues release carbon dioxide. Your red blood cells also transport carbon dioxide to your lungs for you to exhale.

PLATELETS- Platelets are tiny blood cells that help your body form clots to stop bleeding. If one of your blood vessels gets damaged, it sends out signals to the platelets. The platelets then rush to the site of damage and form a plug (clot) to fix the damage.

What are the 3 functions of platelets?While the primary function of the platelet is thought to be hemostasis, thrombosis, and wound healing through a complex activation process leading to integrin activation and formation of a “core” and “shell” at the site of injury, other physiological roles for the platelet exist including immunity and communication

A normal platelet count ranges from 150,000 to 450,000 platelets per microliter of blood. Having more than 450,000 platelets is a condition called thrombocytosis; having less than 150,000 is known as thrombocytopenia. You get your platelet number from a routine blood test called a complete blood count (CBC).

Foods rich in folate, vitamin B 12, vitamin C, D, K and iron are known to increase the platelet counts.

Papaya leaf. …
Wheatgrass. …
Pomegranate. …
Pumpkin. …
Vitamin C rich foods. …
Raisins. …
Brussel sprouts. …
Beetroot.

——————————————————————————————–

HUMAN BODY AND ORGAN SYSTEM

——————————————————————————————–

Tissue…

Tissue is a group of cells that have similar structure and that function together as a unit. A nonliving material, called the intercellular matrix, fills the spaces between the cells. … There are four main tissue types in the body: epithelial, connective, muscle, and nervous. Each is designed for specific functions.

Heart

Definition:

The heart is a muscular organ located in the chest, slightly to the left of the center. It acts as a pump, circulating blood throughout the body, supplying oxygen and nutrients to tissues, and removing waste products like carbon dioxide.

Function:

The primary function of the heart is to maintain blood circulation in the body. It does this by pumping oxygenated blood to the body’s tissues and returning deoxygenated blood to the lungs for oxygenation. This continuous cycle supports all bodily functions and maintains homeostasis.

Parts of the Heart:

Chambers:
- Right Atrium: Receives deoxygenated blood from the body through the superior and inferior vena cava.
- Right Ventricle: Pumps deoxygenated blood to the lungs via the pulmonary artery.
- Left Atrium: Receives oxygenated blood from the lungs through the pulmonary veins.
- Left Ventricle: Pumps oxygenated blood to the body through the aorta. It is the strongest chamber due to the high pressure needed to supply the entire body.
Valves:
- Tricuspid Valve: Between the right atrium and right ventricle, preventing backflow into the atrium.
- Pulmonary Valve: Between the right ventricle and pulmonary artery, controlling blood flow to the lungs.
- Mitral (Bicuspid) Valve: Between the left atrium and left ventricle, preventing backflow.
- Aortic Valve: Between the left ventricle and aorta, ensuring blood flows into the aorta without returning to the ventricle.
Blood Vessels:
- Aorta: The largest artery, distributing oxygenated blood to the body.
- Pulmonary Arteries: Carry deoxygenated blood from the right ventricle to the lungs.
- Pulmonary Veins: Return oxygenated blood from the lungs to the left atrium.
- Vena Cava (Superior and Inferior): Carry deoxygenated blood from the body to the right atrium.
Conductive System:
- Sinoatrial (SA) Node: Known as the natural pacemaker, it initiates the heartbeat.
- Atrioventricular (AV) Node: Receives impulses from the SA node and relays them to the ventricles.
- Bundle of His and Purkinje Fibers: Distribute electrical impulses to the ventricles, causing contraction.

Heart Anatomy

Summary:

The heart is a vital organ responsible for maintaining the circulation of blood, ensuring oxygen and nutrients reach all body tissues while removing waste products. It is composed of four chambers, valves to maintain unidirectional blood flow, major blood vessels for circulation, and a conductive system to regulate heartbeat.

Lungs

Definition:

The lungs are a pair of spongy, air-filled organs located on either side of the chest (thorax). They are responsible for the process of respiration, which is the exchange of oxygen and carbon dioxide between the body and the environment.

Parts of the Lungs:

Trachea (Windpipe): The main airway that brings inhaled air into the lungs.
Bronchi: Two large tubes that branch off from the trachea, each entering a lung.
Bronchioles: Smaller branches of the bronchi that spread throughout the lungs.
Alveoli: Tiny air sacs at the end of the bronchioles where gas exchange occurs.
Pleura: A thin membrane that covers the lungs and lines the chest cavity, reducing friction during breathing.
Diaphragm: A muscle below the lungs that contracts and relaxes to facilitate breathing.

Function of the Lungs:

Gas Exchange: Oxygen from inhaled air is transferred to the bloodstream, and carbon dioxide is expelled from the blood to the air in the lungs.
Regulation of pH: By controlling the levels of carbon dioxide, the lungs help maintain the body’s acid-base balance.
Protection and Filtration: The respiratory system filters out dust, pollutants, and microorganisms.
Vocalization: Air passing through the vocal cords in the larynx produces sound for speech.
Olfaction (Smell): Airborne molecules are detected by sensory receptors in the nasal cavity.

Do you need more detailed information on any part or function?

https://byjus.com/biology/human-lungs-diagram/