NEET Biology question

People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude of 5400 metres have around 8 million. This is because at high altitude

(A)People eat more nutritive food, therefore more RBCs are formed
(B)People get pollution-free air to breathe and more oxygen is available
(C)Atmospheric O level is less and hence more RBCs are needed to absorb the required amount of O to surviveCorrect
(D)There is more UV radiation which enhances RBC production

Answer: (C)

Solution

At high altitude the lower atmospheric pressure reduces the partial pressure of O, and the body compensates by producing more

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Question ID VK-119226