What is Functional Residual Capacity (FRC)?

Functional Residual Capacity (FRC) is the volume of air that remains in the lungs after a normal exhalation. It represents the equilibrium point between the elastic recoil of the lungs, which tends to collapse them, and the expansion of the chest wall, which tends to enlarge them. FRC plays a crucial role in maintaining lung function and gas exchange, as it ensures that there is a sufficient amount of air in the lungs to allow for efficient oxygen uptake and carbon dioxide removal. Any disruption in FRC can lead to respiratory problems and compromise overall respiratory function.