People living at sea level have around 5 mill | vedclass

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(C) : At high altitudes,the composition of air remains almost the same as at sea level,but the density (barometric pressure) of air gradually decrease

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atmospheric $O_2$ level is less and hence more $RBCs$ are needed to absorb the required amount of $O_2$ to survive.

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(C) : At high altitudes,the composition of air remains almost the same as at sea level,but the density (barometric pressure) of air gradually decreases,due to which arterial $pO_2$ is also decreased (hypoxemia).High altitudes present complex conditions to which the human body has to acclimatize.The 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 red blood cells are needed to trap $O_2$ from rarefied air having low $pO_2$ (partial pressure of oxygen).

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

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