Residual volume and vital capacity are defined as which of the following?

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Multiple Choice

Residual volume and vital capacity are defined as which of the following?

The question is testing your understanding of two lung volumes: what residual volume is and what vital capacity represents. Residual volume is the air left in the lungs after you forcefully exhale to the point of maximal exhalation. This remaining air keeps the alveoli from collapsing and prevents the lungs from completely deflating. Vital capacity is the total amount of air you can move in and out of the lungs in one full respiratory effort—essentially from a maximal inhalation to a maximal exhalation. It equals the sum of inspiratory reserve, tidal, and expiratory reserve volumes, so it reflects how much air the lungs can actively ventilate in a single maneuver. So the correct statement describes residual volume as air remaining after maximal exhalation and vital capacity as the maximum amount of air moved during a single respiratory cycle. The other phrasings either misstate whether residual air is left after inhalation versus exhalation or mix in tidal or quiet-breathing volumes, which aren’t what vital capacity measures.

The question is testing your understanding of two lung volumes: what residual volume is and what vital capacity represents. Residual volume is the air left in the lungs after you forcefully exhale to the point of maximal exhalation. This remaining air keeps the alveoli from collapsing and prevents the lungs from completely deflating. Vital capacity is the total amount of air you can move in and out of the lungs in one full respiratory effort—essentially from a maximal inhalation to a maximal exhalation. It equals the sum of inspiratory reserve, tidal, and expiratory reserve volumes, so it reflects how much air the lungs can actively ventilate in a single maneuver.

So the correct statement describes residual volume as air remaining after maximal exhalation and vital capacity as the maximum amount of air moved during a single respiratory cycle. The other phrasings either misstate whether residual air is left after inhalation versus exhalation or mix in tidal or quiet-breathing volumes, which aren’t what vital capacity measures.

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