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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

Raises the `_pCO_2` of blood to 75 mm of Hg

C

Is enough to keep oxyhemoglobin saturation at 96%

D

helps in releasing more `O_2` to the epithelial tissues

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