Question

At the end of normal expiration, the volume of gas remaining in the lungs is referred to as:

a) Total lung capacity
B) Inspiratory capacity
C) Functional residual capacity
D) Forced vital capacity
E Closing capacity

Answer 1

The volume of gas remaining in the lungs at the end of a normal expiration is called the Functional Residual Capacity (FRC).

Step-by-step explanation:

At the end of a normal expiration, the volume of gas remaining in the lungs is referred to as the Functional Residual Capacity (FRC). The FRC includes the expiratory reserve volume (ERV) and the residual volume (RV). Specifically, the FRC measures the amount of air that is still present in the lungs after a normal, unforced exhalation. Unlike total lung capacity, which is the sum of all lung volumes, or inspiratory capacity, which is the sum of tidal volume and inspiratory reserve volume, FRC deals with the air left in the lungs during regular breathing cycles.