PHYS20009 Lecture Notes - Lecture 3: Tidal Volume, Gas Exchange, Lung Volumes

• School: University of Melbourne
• Department: Physiology
• Course: PHYS20009
• Professor: Charles

Document Summary

* in the respiratory system there are regions where gas exchange occurs and areas where gas e(cid:454)cha(cid:374)ge do(cid:374)"t occu(cid:396) * thin cells are needed for effective gas exchange, so diffusion of oxygen and carbon dioxide can occur. Only place gas exchange can occur is in the lungs/alveoli. * tidal volume (vt) volume of air entering/leaving lung in a normal breath (normal breathing) * deadspace volume volume of air not available for gas exchange (e. g. the air trapped in the trachea where there is no capacity for gas exchange) * total pulmonary ventilation volume of air moved into and out of the lungs each minute. * alveolar ventilation volume of air exchanged between atmosphere and alveoli per minute (amount of air available for gas exchange and therefore will be smaller than total pulmonary ventilation) * residual volume amount of air that remains in lungs after fully exhaling.