Question

multiple choice question
which volume is defined as the amount of air that remains in the lungs after a maximal forced expiration?
o expiratory reserve volume (erv)
o vital capacity (vc)
o residual volume (rv)
o inspiratory reserve volume (irv)

Explanation:

• Expiratory reserve volume (ERV): It is the additional amount of air that can be exhaled after a normal exhalation, not after a maximal forced expiration.
• Vital capacity (VC): It is the total amount of air that can be exhaled after a maximal inhalation. It is the sum of tidal volume, inspiratory reserve volume, and expiratory reserve volume.
• Residual volume (RV): By definition, it is the volume of air that remains in the lungs after a maximal forced expiration. This air remains in the lungs to keep the alveoli open and prevent them from collapsing.
• Inspiratory reserve volume (IRV): It is the additional amount of air that can be inhaled after a normal inhalation.

Answer:

Residual volume (RV)