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Q.

Which of the following occurs during expiration in humans?

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a

Decrease in the intra – pulmonary pressure 

b

Relaxation of external inter – coastal muscles 

c

Increase in the volume of thoracic chamber 

d

Contraction of diaphragm

answer is C.

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Detailed Solution

During expiration, the diaphragm and external intercostal muscles relax. As the diaphragm relaxes, it moves upward, and the external intercostal muscles relax, causing the rib cage to decrease in size. This decrease in thoracic volume increases the pressure within the lungs, causing air to flow out of the lungs.

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