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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

It raises the `pco_(2)` of blood to 75 mm of Hg

B

It is enough to keep oxyhaemoglobin

C

It helps in releasing more `O_(2)` to the epithelial tissues.

D

It acts as a reserve during muscular exercises

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The correct Answer is:
D
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