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Question

After complete exhalation the lungs of a healthy man contains a litre of gas; this quantity is known as:

A
Residual volume
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B
Functional residual capacity
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C
Total lung capacity
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D
Dead space
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Solution

The correct option is A Residual volume
The lungs are never completely empty. There is always some air left in the lungs even after a maximal exhalation. The expiratory reserve volume (ERV), about 1,200 mL, is the additional air that can be forcibly exhaled after the expiration of a normal tidal volume. Residual volume (RV), about 1,200 mL, is the volume of air still remaining in the lungs after the expiratory reserve volume is exhaled.

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