Question

how does erythropoietin help with acclimatization?
a.) it increases the affinity of hemoglobin for oxygen.
b.) it reduces nitrogen bubbles in the blood.
c.) it stimulates red blood cell production.
d.) it causes the kidneys to excrete more fluid from the blood into the urine, thereby reducing the volume of plasma.

Explanation:

Erythropoietin (EPO) is a hormone produced mainly by the kidneys. Its primary role in the context of acclimatization (such as when adapting to high - altitude environments where oxygen levels are lower) is to stimulate the bone marrow to produce more red blood cells. Red blood cells contain hemoglobin, which carries oxygen. By increasing the number of red blood cells, more oxygen can be transported throughout the body.

• Option a: The affinity of hemoglobin for oxygen is mainly affected by factors like pH, temperature, and 2,3 - bisphosphoglycerate (2,3 - BPG), not erythropoietin.
• Option b: Reducing nitrogen bubbles in the blood is related to decompression (e.g., in divers coming up from deep water), and has no relation to erythropoietin.
• Option d: Erythropoietin does not have a direct role in fluid excretion by the kidneys.

Answer:

c. It stimulates red blood cell production.