The ____ residual capacity is the volume of gas in the lungs at the end of a normal tidal volume exhalation.
A) maximum
B) inspiratory
C) functional
D) total

Question

The ____ residual capacity is the volume of gas in the lungs at the end of a normal tidal volume exhalation.​
A) ​maximum
B) ​inspiratory
C) ​functional
D) ​total

Quizplus · Accepted Answer

Functional residual capacity (FRC) is the volume of gas remaining in the lungs at the end of a normal tidal volume expiration. FRC is important for ensuring that gas exchange in the lungs is efficient by allowing for the mixing of fresh inspired air with air that has already been in the lungs. The other options are not correct:
- Maximum residual capacity does not exist as a term in respiratory physiology.
- Inspiratory residual capacity is not a term in respiratory physiology.
- Total residual capacity is the sum of residual volume (RV) and expiratory reserve volume (ERV), which is not the same as FRC.

The ____ Residual Capacity Is the Volume of Gas in the Lungs