<prompt> Functional residual capacity represents the volume of air remaining in lungs:-After normal inspirationAfter normal expirationAfter forceful expirationAfter forceful inspiration  <response>: Functional residual capacity: - It equals the EXPIRATORY RESERVE VOLUME RESIDUAL VOLUME - This capacity is amount of air that remains in lungs at end of normal expiration about 2300 ML Pulmonary capacities: Inspiratory capacity: - Tidal volume inspiratory reserve volume - This capacity is amount of air a person can breathe in, beginning at normal expiratory level distending the lungs to maximum amount. Vital capacity: - Inspiratory reserve volume tidal volume expiratory reserve volume. - This capacity is max amount of air a person can expel from lungs after first filling the lungs to their maximum extent then expiring to maximum extent about 4600ml Total lung capacity: - Max vol to which lungs can be expanded with greatest possible effo - Vital capacity residual volume 