Home Biology Breathing and Exchange of Gases Skill Builder Sequentially arrange the following steps in …
Biology Breathing and Exchange of Gases Skill Builder Single Correct MCQ
Published on: August 12, 2026

Sequentially arrange the following steps in the expiration process:

A
Air is expelled from the lungs
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B
Relaxation of the diaphragm and intercostal muscles
- - -
C
Increase in intra-pulmonary pressure
- - - -
D
Reduction in thoracic volume Options: - - - -

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Expiration starts with the relaxation of the diaphragm and intercostal muscles, which decreases the thoracic volume. This reduction causes an increase in intrapulmonary pressure, leading to the expulsion of air from the lungs.

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