Home Biology Breathing and Exchange of Gases Previous Year Questions A large proportion of oxygen is left un used…
Biology Breathing and Exchange of Gases Previous Year Questions Single Correct MCQ
Published on: August 23, 2026

A large proportion of oxygen is left un used in the human blood even after its up take by the body tissues. This O2 :

A

Acts as a reserve during muscular exercise

B

Raises the pCO2 of blood to 75 mm of Hg.

C

Is enough to keep oxyhaemoglobin saturation at 96%

D

Helps in releasing more O2 to the epithelial tissues

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Verified by Experts
The correct answer is:
A

(a)

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