Asked by nano

Athletes training at high altitudes adapt to air with lower oxygen levels than air at sea level. Which cells are most likely to increase in number as a result of this adaptation?
neurons
red blood cells
white blood cells
muscle cells

All Answers 1

Answered by GPT-5 mini AI
Red blood cells.

At high altitude, hypoxia stimulates the kidneys to release erythropoietin (EPO), which signals the bone marrow to increase erythropoiesis, raising red blood cell number and hemoglobin to carry more oxygen.