Which of the following is true regarding expiration?

Exhaled air contains more moisture

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Lungs are not completely emptied even after forceful exhalation

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Exchange of gases takes place during expiration

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All of the above

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Solution

The correct option is D All of the above
Expiration is a mechanism in which air which contains carbon dioxide release out from the lungs of the body.
This air is dry and contains more moisture from the lungs.
Lungs can never be empty even after force full expiration some amount of air remains in it known as residual volume.
The exchange of gases occurs only at cellular and alveolar site, not in expiration.
So the correct option is 'Both A and B'.

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