[英文释义] The volume of air remaining in the LUNGS at the end of a normal,quiet expiration. It is the sum of the RESIDUAL VOLUME and the EXPIRATORY RESERVE VOLUME. Common abbreviation is FRC.
Preoxygenation replaces the primarily nitrogenous mixture of ambient air, which constitutes the patient's functional residual capacity, with oxygen 这样可以用氧气取代之前被氮气占据的肺泡。