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)`

Acts as a reserve during muscular exercise

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

Is enough to keep oxyhemoglobin saturation at 96%

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

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The correct Answer is:

Oxygenated blood is about 99% saturated with oxygen , while deoxygenated blood is also 75% staurated with oxygen. This oxygen acts as a reservoir during increased deamand e.g., heavy exercise , when each decilitre can give 15ml, of oxygen to the body tisses ( 3 times more ).

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