Question

82. At high altitude, the
(A) number of RBC increases
(C) number of RBC decreases
(B) size of RBC increases
(D) size of RBC decreases​

Answer 1

Explanation:

the correct answer is c

Answer 2

Answer:

$\bigstar$ (A) number of RBC increases $\bigstar$

Explanation:

At high altitudes, there is a decrease in oxygen hemoglobin saturation. This hypoxic condition causes hypoxia-inducible factor 1 to become stable and stimulates the production of erythropoietin (EPO), a hormone secreted by the kidneys. EPO stimulates red blood cell production from bone marrow in order to increase hemoglobin saturation and oxygen delivery.

Thus, the total number of RBC increases.