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A large proportion of oxygen is left unu...

A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. This `O_2`

A

acts as a reserve during muscular exercise

B

raise the `pCO_2` of blood to 75 mm of Hg

C

is enough to keep oxyhaemoglobin saturation at `96%`

D

helps in releasing more `O_2` to the epithelial tissues

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The correct Answer is:
A
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