Question

At high altitude, RBCs of human will

• A. Increase in number
• B. Decrease in number
• C. Decrease in size
• D. Increase in size

Answer 1

The correct option is A Increase in number

RBC's are the carriers of oxygen. It has a pigment known as haemoglobin which attaches to oxygen molecules and carries it to the tissues. At high altitudes, there is a lower concentration of oxygen so the body must be supplied with more oxygen. For that purpose RBC's increase in number so that haemoglobin can carry more oxygen to the organs and tissues of the body.

So, the correct answer is option A.