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Q.

Which of the following occurs during exhalation?

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a

There is negative pressure in the lungs with respect to atmospheric pressure

b

External intercostal muscles contract

c

Ribs and sternum are raised up

d

The diaphragm becomes arched upwards

answer is A.

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Detailed Solution

During exhalation, the diaphragm relaxes and becomes arched upwards. Contraction of external costal muscles, raising of the ribs and sternum occur during inspiration. There is a negative pressure in the lungs with respect to atmospheric pressure during inspiration.

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