It has been found that people living in very high mountains have many more red corpuscles in their blood than people living in plains. Which one of the following best accounts for this phenomenon?
At higher altitudes, the atmospheric pressure is low and hence body doesn’t get enough oxygen. This leads to many symptoms. More the number of RBC, more is the amount of oxygen that circulates in the body. Thus, to increase amount of oxygen, at low pressure, more RBC is required in the blood.