Cardio-respiratory (http://stgan - Angelfire

- The catch is that this rate does NOT equal CO2 production. - Because the body has a large capacity for buffering CO2, PCO2 only climbs at about 3 mm Hg per minute during apnoea. Thus the partial pressure of CO2 in the Functional Residual Capacity climbs at the same rate - which corresponds to a volume change of about 10 mls. ................
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