During normal expiration, the diaphragm is:

Arched

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Flattened

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Not involved

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Perforated

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Solution

The correct option is A Arched
During expiration, the intercostal muscles and the diaphragm are relaxed leading to decrease in the volume of the thoracic cavity so that the air is expired from the lungs. The relaxed diaphragm gets arched up forming a dome. The correct solution is option A.

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