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Select the correct statement. (a) Expiration is initiated due to contraction of diaphragm. (b) Expiration occurs due to external intercostal muscles. (c) Intrapulmonary pressure is lower than the atmospheric pressure during inspiration. (d) Inspiration occurs when atmospheric pressure is less than intrapulmonary pressure.

1. (a) Expiration is initiated due to contraction of diaphragm.
2. (b) Expiration occurs due to external intercostal muscles.
3. (c) Intrapulmonary pressure is lower than the atmospheric pressure during inspiration.
4. (d) Inspiration occurs when atmospheric pressure is less than intrapulmonary pressure.

Correct answer: (c) Intrapulmonary pressure is lower than the atmospheric pressure during inspiration.

Solution

Inspiration happens when the thoracic cavity expands, lowering intrapulmonary pressure below atmospheric pressure so air moves in. The other statements reverse the roles of muscles or pressures.

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