NEET Biology Breathing And Exchange Of Gases Based Practice Questions & Answers with Viewers Discussion and Detailed Explanation

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Question & Answer Discuss:

At high altitude, the RBCs in the human blood will

(a) decrease in number

(b) increase in number

(c) increase in size

(d) decrease in size.

Answer: (b)

At high altitudes, arterial $pO_2$ decreases as density of air decreases. Number of RBCs per unit volume of blood is likely to be higher in a person living at high altitudes. More number of RBCs are needed to trap O2 from air having less O2 .

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