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Tidal Volume (TV)
amount of air that enters lungs in a single inhalation or leaves lungs in a single exhalation of quiet breathing; in an adult this is normally 500 mL
Inspiratory Reserve Volume (IRV)
amount of air that can be forcibly inhaled after normal inspiration; also called complemental air; generally measures around 3000 mL
Expiratory Reserve Volume (ERV)
amount of air that can be forcibly exhaled after normal, quiet exhalation; also called supplemental air; approximately 1000 mL
Residual Volume (RV)
air remaining in lungs after forced exhalation; about 1500 mL in an adult
Inspiratory Capacity (IC)
volume of air inhaled after normal exhale
functional residual capacity (FRC)
air that remains in lungs after normal exhalation has taken place
Vital Capacity (VC)
total volume of air that can be exhaled after maximum inhalation; amount will be equal to sum of TV, IRV, and ERV
Total lung capacity (TLC)
volume of air in lungs after maximal inhalation