NEET Biology question

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

(A)Raises the CO of blood to 75 mm of Hg
(B)Is enough to keep oxyhaemoglobin
(C)Helps in releasing more O to the epithelial tissues
(D)Acts as a reserve during muscular exercisesCorrect

Answer: (D)

Solution

At rest, tissues extract only about 25% of the oxygen carried by arterial blood, leaving venous blood still roughly 75% saturated; this unused oxygen is not simply released to epithelial tissues

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Question ID VK-119082