CSB346H1 Lecture Notes - Lecture 2: Respiratory Minute Volume, Respiratory Tract, Gas Exchange
7 Apr 2020
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Index of how much air moves in and out of the lung per minute. Index how how much o2 moves in and out of the lung per minute. 4200 * 21% (only 20% o2) = 882 ml is o2. 250 ml (of 882 ml) diffuses into the blood the remaining. 24 hr/day * 60miin/hr * 250 ml/min = 360 l/day = daily oxygen consumption. Ve = vt * rr (volume of each inflation x times your breath per min) Conducting zone: not useful in gas exchange so called dead space (bronchi and tracheal) so alveolar ventilation is how much air is reaching respiratory zone. Va = (vt*rr) - (dsv*rr) -> (dead space x respiratory rate) (500 ml/breath * 12 breath/min) - (150 ml/breath. * 12 breath/min) = 4200ml/min -> amount of air. * 12 breath/min) = 4200ml/min -> amount of air reaching alveoli. Rate of diffusion of o2 and co2 depends on. Hypoxia: low levels of o2 in the body.
