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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

Acts as a reserve during muscular exercise `:`

B

Raises the `pCO_(2)` of blood to 75mm of Hg.

C

Is enough to keep oxyhaemoglobin sturation at `96%`

D

Helps in releasing more `O_(2)` to the epitheliala tissues

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