Question

Total volume of air a person can expire after a normal inspiration which includes tidal volume and expiratory reserve volume (TV+ERV) is called _________________.

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

Answer 1

The correct option is B expiratory capacity

Expiratory capacity (EC) is the total volume of air that a person can expire after a normal inspiration.
This includes tidal volume and expiratory reserve volume (TV+ERV).

Tidal volume (TV) is the volume of air inspired or expired during a normal respiration. It is approximately 500 mL.

Expiratory reserve volume (ERV) is an additional volume of air that a person can expire by a forcible expiration. This can be on an average 1000 mL to 1100 mL.

Functional residual capacity (FRC) is the volume of air that will remain in the lungs after a normal expiration. This includes both ERV and RV.

Residual volume (RV) is the volume of air remaining in the lungs even after a forcible expiration. This can be from 1100 mL to 1200 mL.