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Respiratory system
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Respiratory system function:-
1.Pulmonary ventilation
2.Internal and external respiration
3.Olfactory—smell
4.Phonetation

Upper respiratory system
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Nasal cavity
Pharynx
Larynx

Lower respiratory system
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Lung
Rib gage

Trachea
Bronchus
Bronchii
Alveioli

Nasal muscles
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Superior conche
Middle conche
Inferior conche


Nasal Muscle bones
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Nasal
Frontal
Maxela
Ethmoid
Vomer

Pharynx bones
Nasopharyx
Oropharynx
Larnyngopharynx

Larynx
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Voice and respiratory tract.
Has bones attached to cartialegenus muscle and help in phoenix.

Trachea

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The trachea, also known as the windpipe, is a cartilaginous tube that connects the larynx to the bronchi of the lungs, allowing the passage of air, and so is present in almost all air-breathing animals with lungs. The trachea extends from the larynx and branches into the two primary bronchi.

Process of respiration

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When we breath in the air, through the opening of nose air enters into nasal cavity.

From Nasal cavity Air passes through
1. Superior conche
2. Middle conche
3. Inferior conche
These are nasal muscles to trachea .

Then through trachea, air passes to lungs.

We know, lungs has Bronchus and branches of it called bronchii . And button like structure called Alveioli.

Alveioli has indirect contact to blood capillaries. This blood capillaries carry oxygen throughout the body. This is called oxygen saturation. With oxymeter we can measure this oxygen saturation level in our body. Oxygen saturation must be above 90 otherwise we have to consult a doctor.

Internal respiration:-

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In blood , oxygen is supplied to red blood cells and with the help of haemoglobin, synthesis of oxygen takes place. This is called internal respiration or cellular respiration.

External respiration:-

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The bi-product CO2 is returned to alveioli and through Bronchus it returns to trachea and back to nasal cavity and through nasal opening the air is given out. The process is called external respiration.