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A large proportion of oxygen is left unu...

A large proportion of oxygen is left unused the human blood even after its uptake by the body tissue. This `O_(2)`

A

Helps in releasing more `O_2` to the epithelial tissues

B

It is enough to keep oxyhaemoglobin saturation at 96%

C

Raise the `PCO_2` of blood to 75 mm of Hg

D

Acts as a reserve during muscular exercise

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The correct Answer is:
D
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