Explain Residual Volume and Functional Residual Capacity
Residual Volume (RV): It is the volume of air that remains in the lungs after maximal expiration. The average volume is about 1200 ml.
Functional Residual Capacity (FRC): It is the volume of air or gas remaining in the lungs after a normal expiration. It varies from 2500 ml to 3000 ml. It is the sum of the residual volume and expiratory reserve volume.