FRC is the reference point for the physiological sigh — the second inhale reinflates alveoli that collapsed toward FRC. Retention holds in power breathing start from a near-FRC empty-lung state.
The volume of air left in the lungs after a normal (not forced) exhale.
FRC is the reference point for the physiological sigh — the second inhale reinflates alveoli that collapsed toward FRC. Retention holds in power breathing start from a near-FRC empty-lung state.