Expiratory reserve volume is best described as which option?

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Multiple Choice

Expiratory reserve volume is best described as which option?

Explanation:
Expiratory reserve volume is the extra air you can forcefully exhale after you have completed a normal, resting exhale. After you breathe out normally, you still have some air in your lungs, and you can push out that additional amount with effort. That is why the best description is the amount of air that can be exhaled after a normal exhalation. The other descriptions refer to residual volume (air left after a maximal exhale) and to total lung capacity (the total air in the lungs after a maximal inhalation), or imply exhaling after a maximal exhale, which isn’t how ERV is defined.

Expiratory reserve volume is the extra air you can forcefully exhale after you have completed a normal, resting exhale. After you breathe out normally, you still have some air in your lungs, and you can push out that additional amount with effort. That is why the best description is the amount of air that can be exhaled after a normal exhalation. The other descriptions refer to residual volume (air left after a maximal exhale) and to total lung capacity (the total air in the lungs after a maximal inhalation), or imply exhaling after a maximal exhale, which isn’t how ERV is defined.

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