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A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. This O2 ?
A) Helps in releasing more O2 to the epithelium tissues
B) Acts as a reserve during muscular exercise
C) Raises the pCO2 of blood to 75 mm of Hg
D) Is enough to keep oxyhaemoglobin saturation at 96%
Explanation:
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