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A. the amount of air left in the lungs at the end of normal resting expiration
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B. the maximal amount of air the can be exhaled after quiet expiration
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C. the volume of air inhaled during inspiration
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D. the volume of air exhaled during exhalation
Explanation
Functional residual capacity (FRC), is the volume remaining in the lungs after a normal, passive exhalation.
It is the combination of residual volume (RV) and the expiratory reserve volume
In a normal individual, this is about 3L.
The FRC also represents the point of the breathing cycle
where the lung tissue elastic recoil and chest wall outward expansion are balanced and equal.
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