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 3 of oxygen to survive
C) there is more UV radiation which enhances RBC production
D) people eat more nutritive food, therefore more RBCs are formed
Correct Answer: B
Solution :
At high altitudes, the atmospheric oxygen level is less and hence, more RBCs are needed to absorb the required amount of oxygen to survive. That is why, the people living at sea level have around 5 million \[RBC/m{{m}^{3}}\] of their blood whereas, those living at an altitude of 5400 metres have around 8 million RBC/mm3 of their blood.
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