CSDS 313: Respiratory Volumes and Capacities

volume

amount of air the lungs can hold

capacity

combinations of 1 or more volumes

4 volumes:

*Tidal Volume (Quiet tidal), Inspiratory Reserve Volume, Expiratory Reserve Volume, *Residual Volume, (dead air)

**Tidal Volume

volume of air that is exchanged during one cycle of respiration
-how much air you take in and out

quiet tidal

tidal volume at rest

**Inspiratory Reserve Volume

the volume of air that can be inhaled after 1 tidal inspiration (aka a deep breathe)
-above and beyond what you would normally inhale (think of what you do in yoga sometimes)

**Expiratory Reserve Volume

the volume of air that can be exhaled after passive, tidal expiration
-resting lung volume (extra air that can be pushed out after 1 exhalation)

**Residual Volume

amount of air that remains in the lungs after a maximum exhalation
-the air that remains in the alveoli
-cannot be exhaled, only when you die

dead air

air that remains only within the Respiratory Tract (oral and pharyngeal cavities & trachea)
-cannot be exhaled, only when you die

4 capacities

**Vital capacity, Functional Residual Capacity, Total Lung Capacity, and Inspiratory Capacity

**Vital capacity

total amount of air that can be inhaled after a maximum exhalation
-INSP + ERV + TV