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Q.

Select the correct set of events that occur during expiration:

a) Relaxation of external intercostal muscles

b) Diaphragm is arched upwards

c) Intra-pulmonary pressure increases

d) Ribs and sternum are lifted up

e) Pulmonary volume increases

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a

(a), (b) and (d)

b

(b), (c) and (d)

c

(b), (d) and (e)

d

(a), (b) and (c)

answer is D.

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Detailed Solution

During expiration, external intercostal muscles relax, diaphragm is arched upwards, pulmonary volume decreases and intra-pulmonary pressure increases. Ribs and sternum are lifted up during inspiration.

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