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Tidal Volume

The amount of air that enters the lungs in a single inhalation or leaves the lungs in a single exhalation of quiet breathing.

Inspiratory reserve volume (IRV)

the air that can be forcibly inhaled after a normal respiration has taken place.

Expiratory reserve volume (ERV)

The amount of air that can be forcibly exhaled after a normal quiet respiration.

Residual Volume (RV)

The air remaining in the lungs after a forced exhalation; about 1500 cc in the adult.

Inspiratory capacity (IC)

the volume of air inhaled after a normal exhale.

Functional residual capacity (FRC)

The air that remains in the lungs after a normal exhalation has taken place.

Vital Capacity (VC)

The total volume of air thatt can be exhaled after a maximum inhalation. This amount will be equal to the sum of TV, IRV, and ERV.

Total lung capacity (TLC)

The volume of air in the lungs after a maximal inhalation.

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