What does the volume of air that remains in the lungs after a normal expiration is called?

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Total lung capacity

Residual volume

Vital capacity

Functional residual capacity

answer is D.

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Detailed Solution

After a normal expiration, the volume of air that remains in the lungs is called functional residual capacity (FRC). FRC is the volume of air in the lungs at the end of a normal expiration when the diaphragm and other respiratory muscles are not working. It is the sum of the residual volume (RV) and the expiratory reserve volume (ERV).

Total lung capacity (TLC) refers to the maximum volume of air that the lungs can hold, including both inspiratory and expiratory reserves.

Vital capacity (VC) is the maximum volume of air that can be exhaled after a maximum inhalation.

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