A) People get pollution-free air to breathe and more oxygen is available
B) Atmospheric \[{{O}_{2}}\] level is less and hence more RBCs are needed to absorb the required amount of \[{{O}_{2}}\]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 composition of air remains almost the same as at sea level, but density (barometric pressure) of air gradually decreases due to which arterial\[p{{O}_{2}}\]is also decreased (hypoxemia). High altitudes present with complex conditions to which human body has to acclimatize. Number of red blood cells per unit volume of blood is likely to be higher in a person living at high altitudes. This is in response to the air being less dense at high altitude. More number of red blood cells are needed to trap\[{{O}_{2}}\]from rarefied air having low\[p{{O}_{2}}\](partial pressure of oxygen).
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