What would be the estimated Functional Residual Capacity for a healthy male with a Residual Volume of 1300 ml and Expiratory Reserve Volume of 1200 ml?

Functional Residual Capacity (FRC) is the volume of air remaining in the lungs after a normal exhalation. It is calculated by adding the Residual Volume (RV) and the Expiratory Reserve Volume (ERV). In this context, the Residual Volume of 1300 ml represents the air that remains in the lungs after a forced exhalation, and the Expiratory Reserve Volume of 1200 ml is the additional amount of air that can be forcibly exhaled after a normal exhalation.

To find the FRC, you simply add these two volumes together:

FRC = RV + ERV

FRC = 1300 ml + 1200 ml

FRC = 2500 ml

This calculation indicates that the estimated Functional Residual Capacity for the healthy male is 2500 ml, making this the correct choice in the context of the respiratory physiology being assessed.