Tidal volume - the volume of air that enters and leaves the lungs at each natural resting breath.
Inspiratory reserve volume (IRV) - the volume of air that can be taken in over and above the normal inspired tidal volume.
Expiratory reserve volume (ERV) - the volume of air that can be expelled over and above the normal inspired tidal volume.
Vital capacity (VC) - tidal volume + IRV + ERV
Residual volume (RV) - the volume of air left in the lungs after the strongest possible expiration.
Total lung capacity (TLC) - the sum of the vital capacity and the residual volume.
Inspiratory capacity (IC) - the volume that can be inspired from the end of a normal expiration.
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