Question

Number of RBC increases if one lives at higher altitude because

• A. There is less oxygen
• B. More heat is required in body for producing body warmth.
• C. There are no germs in mountain air.
• D. There is more oxygen

Answer 1

The correct option is A There is less oxygen

RBC count increases in people living at high altitudes because the atmospheric pressure decreases and the levels of atmospheric oxygen also falls. Hence to carry more amount of oxygen to the cells, more number of red blood cells are required.

Therefore the correct option is A.