Which of these conditions would increase the rate of erythropoiesis?

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All of these conditions would increase the rate of erythropoiesis. At high altitudes, there is reduced oxygen in the air, which leads to hypoxia and triggers the release of erythropoietin (EPO) from the kidneys. Increased physical activity increases oxygen demand, leading to increased EPO secretion. Loss of blood causes a reduction in red blood cell count, which stimulates the kidneys to release EPO to increase erythropoiesis. Increased hormone secretion from the kidneys, specifically EPO, directly stimulates the bone marrow to produce more red blood cells.

Which of These Conditions Would Increase the Rate of Erythropoiesis