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A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. This O2

1. acts as a reserve during muscular exercise
2. raise the pCO2 of blood to 75 mm of Hg.
3. is enough to keep oxyhaemoglobin saturation at 96%
4. helps in releasing more O2 to the epithelial tissues

Correct answer: acts as a reserve during muscular exercise

Solution

A significant amount of oxygen remains bound to haemoglobin after resting tissues extract what they need. This leftover oxygen serves as a reserve that can be tapped during muscular exercise when oxygen demand increases sharply.

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