NEET Biology question

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

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

Answer: (B)

Solution

Atmospheric oxygen partial pressure falls with altitude, so the body compensates for this reduced oxygen availability by increasing RBC and

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Question ID VK-115961