FRC Full Form in Medical term is Functional Residual Capacity. The amount of air left in your lungs following a full, passive exhale is known as your functional residual capacity (FRC). It’s around 3 liters in a typical person.
At the FRC, the elastic recoil of the lung tissue and the outward expansion of the chest wall are in equilibrium with one another. Since the FRC is both a volume and intimately linked to two respiratory structures, it stands out from other similar measures.
The FRC is defined as the total volume volume of air in the lungs at the bottom of the tidal volume, where the TV is the volume of air that a person ordinarily inspires and expires. The functional residual capacity (FRC) of the lungs is a multi-volume sum. It also can’t be determined indirectly via spirometry and must be calculated instead.
Reason being that FRC is a sum of ERV and RV, or expiratory reserve volume and residual volume (RV). When a person exhales as much air as possible from their lungs, the amount of air that remains is known as the residual volume. The air that keeps the alveoli dilated is called the residual volume, and it can never be expelled. The amount of air left over after one has breathed normally is known as one’s expiratory reserve volume (ERV).