Give reasons : Expiration is called a passive process. - Vidyadip

Question

Give reasons : Expiration is called a passive process.

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Answer

During expiration, intercostal muscles relax. This results in pulling the ribs inwards.
Diaphragm also relaxes and returns to its normal dome shape.
The collective contraction of ribs and diaphragm results in the reduction of
thoracic cavity and hence automatically air is pushed out of the lungs.
Since the pressure on the lungs increase rushing the air to outside, expiration is called a passive process.

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