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People living at sea level have around 5 million RBG per cubic | NEET MCQ BIOLOGY

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

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7%
People eat more nutritive food, therefore more RBCs are formed
23%
People get pollution-free air to breath and more oxygen is available
64%
Atm.O2​ level is less & hence more RBCs are needed to absorb the require amount of O2​ to survive
5%
There is more UV radiation which enhances RBC production