A large proportion of oxygen is left un used in the human b… | CGP Edu

Biology Breathing and Exchange of Gases Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 21, 2026

A large proportion of oxygen is left un used in the human blood even after its up take by the body tissues. This O 2 :

A

Acts as a reserve during muscular exercise

B

Raises the pCO 2 of blood to 75 mm of Hg.

C

Is enough to keep oxyhaemoglobin saturation at 96%

D

Helps in releasing more O 2 to the epithelial tissues

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