A large proportion of oxygen remains unused in the human blood even after its uptake by the body tissues. This o2 acts as a reserve during muscular exercise raises the pco2 of blood to 75 mm of hg is enough to keep oxyhaemoglobin saturation at 96% helps in releasing more o2 to the epithelial tissues.
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a large proportion of oxygen remain exchange unused in human blood even after its untake by the body tissues this 02 act as reverse
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