Which statement about residual volume is true?

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Multiple Choice

Which statement about residual volume is true?

Explanation:
Residual volume is the air remaining in the lungs after a maximal exhalation. This leftover air cannot be expelled and helps keep the airways and alveoli open between breaths, ensuring continuous gas exchange. It’s not the maximum air you can exhale, nor the portion of air that reaches the alveoli on each breath (that’s alveolar ventilation), nor the total air inhaled per minute (minute ventilation). So, the true description is that residual volume is the air remaining after a maximal exhalation.

Residual volume is the air remaining in the lungs after a maximal exhalation. This leftover air cannot be expelled and helps keep the airways and alveoli open between breaths, ensuring continuous gas exchange. It’s not the maximum air you can exhale, nor the portion of air that reaches the alveoli on each breath (that’s alveolar ventilation), nor the total air inhaled per minute (minute ventilation). So, the true description is that residual volume is the air remaining after a maximal exhalation.

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