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The quantity 1500 ml in the respiratory volumes of a normal human adult refers to

1. maximum air that can be breathed in and breathed out
2. residual volume
3. expiratory reserve volume
4. total lung capacity

Correct answer: residual volume

Solution

Residual volume is the air that cannot be expelled from the lungs, even after maximal forced expiration. A value around 1500 mL matches this remaining air, not the volumes that can be actively inhaled or exhaled.

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