tidal volume
volume moved in or out during a normal breath
inspiratory reserve volume
volume that can be inhaled during forced breathing in addition to tidal volume
expiratory reserve volume
volume that can be exhaled during forced breathing in addition to tidal volume
residual volume
volume that remains in lungs at all times
inspiratory capacity =
TV + IRV
functional residual capacity =
ERV + RV
vital capacity =
TV + IRV + ERV
total lung capacity =
VC + RV
Respiratory Volumes and Capacities
minute ventilation
*tidal volume multiplied by breathing rate
*amount of air that is moved into the respiratory passageways
alveolar ventilation rate
major factor affecting concentrations of oxygen and carbon dioxide in the alveoli
volume of air that reaches alveoli
tidal volume minus physiologic dead space then multiplied by breathing rate
Tidal Volume (TV)
The volume of one breath
Inspiratory Reserve Volume (IRV)
Additional volume inhaled while taking a very deep breath
Expiratory Reserve Volume (ERV)
Volume of air in excess of TV that can be exhaled forcibly
Residual Volume (RV)
Volume of air still contained in the lungs after a maximal expiration
Vital Capacity (VC)
IRV + TV + ERV
Total Lung Capacity (TLC)
TV + IRV + ERV + RV
Minute Respiratory Volume (MRV)
Tidal Volume X (Breaths/minute)
i.e 500ml/breath x 12 br/m = 6,000ml/min