Question

Volume of air that will remain in the lungs after a normal expiration, which includes ERV+RV is called _________________.

• A. inspiratory capacity
• B. expiratory capacity
• C. functional residual capacity
• D. none of the above

Answer 1

The correct option is C functional residual capacity

Functional Residual Capacity (FRC) is the volume of air that will remain in the lungs after a normal expiration. This includes a combination of Expiratory Reserve Volume (ERV) and Residual volume (RV).

Expiratory Reserve Volume (ERV) is the additional volume of air that a person can expire by a forcible expiration. The average ERV is 1000 mL to 1100 mL.

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. 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.