Question

There is less oxygen in the air at high altitudes than at sea level. Scientists have
shown that people living at sea level have about 5 million red blood cells per mm of
blood whereas people living at high altitude have 7 million red blood cells per mm
of blood.
Suggest a reason for this difference.​

Answer 1

Answer:

this is because :

Atmospheric O2 level is less so that more RBCs are needed to absorb the required amount of O2 to survive. At an altitude of 5400 m, the concentration of atmospheric oxygen is very low. Hence, to fulfill the oxygen requirement of our body, more RBCs are needed.