The following are the events that occur during expiration.
(a) Diaphragm and external intercostal muscles relax. Diaphragm and sternum return to their normal position.
(b) Air is expelled out of the lungs
(c) Volume of thoracic cavity decreases
(d) Intrapulmonary pressure increases
Select the correct sequence of their occurrence.

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(b), (c), (d), (a)

(a), (b), (c), (d)

(b), (d), (c), (a)

(a), (c), (d), (b)

answer is D.

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Detailed Solution

Relaxation of the diaphragm and intercostal muscles returns the diaphragm to its normal position and reduces the thoracic volume. The decrease in lung volume leads to an increase in intra-pulmonary pressure, causing the expulsion of air.

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