Question

Number of RBC is more in people living on hills because __________________.

• A. There is less oxygen
• B. Air is more purified
• C. Heat is required to warm the body
• D. Oxygen concentration is more

Answer 1

Answer: (A)

There is less oxygen

As we move from low altitude to high altitude, the air starts getting thinner and thinner. The partial pressure of oxygen starts decreasing with increasing altitude. Now, since the partial pressure of oxygen is less in our lungs, the binding of oxygen to haemoglobin in RBCs also decreases.

So, the correct answer is option A.