JBL EMT Practice Exam

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The amount of air that remains in the lungs simply to keep them open is called the:

  1. Expiratory reserve volume

  2. Inspiratory reserve volume

  3. Residual volume

  4. Tidal volume

The correct answer is: Expiratory reserve volume

The expiratory reserve volume is the amount of air that can still be exhaled after a normal exhalation. The other options, B (inspiratory reserve volume) and D (tidal volume) relate to the amount of air that can be breathed in, while the residual volume (C) is the amount of air that remains in the lungs even after a forceful exhalation. Therefore, the expiratory reserve volume is the only option that accurately represents the amount of air left in the lungs simply to keep them open.

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