A) people get pollution-free air to breathe and more oxygen is available
B) atmospheric\[{{\text{O}}_{\text{2}}}\] level is less and hence more RBCs are needed to absorb the required amount of \[{{\text{O}}_{\text{2}}}\]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 \[{{\text{O}}_{\text{2}}}\]level is less and hence, more RBCs are needed to absorb the required amount of \[{{\text{O}}_{\text{2}}}\] 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 m have around 8 million \[RBC/m{{m}^{3}}\]of their, blood.
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