NEET 2011 Biology question

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

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

Answer: (1)

Solution

Arterial blood is about 97% saturated with oxygen and venous blood returning from the tissues is still about 75% saturated, so only about 25% of the oxygen is used at rest. The remaining oxyhaemoglobin acts as a reserve of oxygen that can be drawn on during

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Question ID VK-090870