Question

Explain the process of inspiration and expiration under normal conditions

Answer 1

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Inspiration and Expiration. Inspiration and expiration occur due to the expansion and contraction of the thoracic cavity, respectively. The process of normal expiration is passive, meaning that energy is not required to push air out of the lungs
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Answer 2

☯️ $\sf\underline\red{ Inspiration \: \: }$ :-

1. Intake of atmospheric air into the lungs is called Inspiration.
2. It is an active process.
3. It takes place by the contraction of muscles of the diaphragm.
4. This makes the diaphragm flat and increases thoracic volume in antero posterior axis.
5. The contraction of external intercostal muscles raise the ribs side ways and increase the thoracic volume in dorson ventral axis.
6. When the ribs and diaphragm are drawn out they pull the pleural membrane attached to lungs.
7. Then the pressure inside the lungs decreases than that of the atmosphere.

☯️ $\sf\underline\red{ Expiration \: \: }$ :-

1. Sending out air from lungs is called Expiration.
2. It is a passive process.
3. The external intercostal muscles contract.
4. The volume of the thoracic cavity is reduced.
5. The air is forced out through air passages.

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