1.

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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