Question

The additional volume of air that a person can expire by a forcible expiration is called __________.

• A. residual volume
• B. tidal volume
• C. inspiratory reserve volume
• D. expiratory reserve volume

Answer 1

The correct option is D expiratory reserve volume

Expiratory Reserve Volume (ERV) is the additional volume of air that a person can expire by a forcible expiration. The extra volume of air that can be expired with maximum effort beyond the level reached at the end of a normal expiration.

Residual volume (RV) is the volume of air remaining in the lungs after maximum forceful expiration. In other words, it is the volume of air that cannot be expelled, thus causing the alveoli to remain open at all times. The residual volume remains unchanged regardless of the lung volume at which expiration was started. Values for residual volume are 1 to 1.2 L, but these values are dependent on factors including age, gender, height, weight, and physical activity levels.

Tidal volume is the amount of air that moves in or out of the lungs with each respiratory cycle during normal breathing. The normal value is approximately 500 mL.

Inspiratory reserve volume (IRV) is the additional volume of air that a person can inspire by a forcible inspiration.