Question

People living at sea level blood, whereas those living at an altitude of $5400m$ have around $8$ millions. This is because at high altitude

• A. People get pollution-free air to breathe and more oxygen is available
• B. Atmospheric oxygen is available is less and hence, more RBC's are needed to absorb the required amount of oxygen to survive
• C. There is more UV radiation, which enhances RBCs production
• D. People eat more nutritive food, therefore, more RBCs are formed

Answer 1

The correct option is B Atmospheric oxygen is available is less and hence, more RBC's are needed to absorb the required amount of oxygen to survive

At high altitudes, the atmospheric oxygen level is less and hence, more RBCs are needed to absorb the required amount of oxygen to survive. People living at sea level have around 5 million RBCs/mm${}^2$ in their blood, whereas those living at an altitude of 5400m have around 8 million RBCs/mm${}^2$ in their blood.

Thus, the correct answer is option B.