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Exhalation is the process of expulsion o...

Exhalation is the process of expulsion of air through the respiratory tract. Which figure illustrates the process of exhalation ?

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
A
During exhalation thoracic cavity decreases and thus pressure increases. It is facilitated by:-
* Relaxation of external intercostal muscles which pulls the rips downward and thus decreases thoracic cavity.
* Relaxation of phrenic muscles of diaphragm results in return to its done shaped position.
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