pulmonary volume and capacities

scioly 2627

Tidal Volume (TV)

the volume of air inspired or expired in a regular breath (500 mL)

Inspiratory Reserve Volume (IRV)

the maximum amount of air that can be inspired after breathing in normally (3000 mL)

Expiratory Reserve Volume (ERV)

the maximum amount of air that can be expired after breathing out normally (1100 mL)

Residual Volume (RV)

the amount of air still remaining in the respiratory passages and lungs after a maximum expiration (1200 mL)

Functional Residual Capacity (FRC)

ERV + RV

Inspiratory Capacity (IC)

TV + IRV

Vital Capacity (VC)

IRV + TV + ERV

Total Lung Capacity (TLC)

IRV + ERV + TV + RV (normally 6000mL in a healthy male adult)

Pulmonary Ventilation

TV * respiratory rate (the total volume of gas entering the lungs per minute)

Alveolar ventilation

(TV - dead space) * respiratory rate (the volume of gas per unit time that reaches the alveoli, the respiratory portions of the lungs where gas exchange occurs.)

Dead space ventilation

dead space * respiratory rate (the volume of gas per unit time that does not reach these respiratory portions, but instead remains in the airways [trachea, bronchi, etc.])