When a patient becomes hypoxic, which physiological response stimulates increased hemoglobin production?

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Multiple Choice

When a patient becomes hypoxic, which physiological response stimulates increased hemoglobin production?

When tissues become hypoxic, the kidney acts as the oxygen sensor and ramps up erythropoietin production. Specialized cells in the renal cortex detect the low oxygen tension and increase erythropoietin release, driven by hypoxia-inducible factors. Erythropoietin then travels to the bone marrow and stimulates erythroid progenitor cells to proliferate and mature into red blood cells, boosting hemoglobin and the blood’s oxygen-carrying capacity. In adults, the kidney is the main source of erythropoietin, while the liver’s role is minimal postnatally. The lungs do not produce erythropoietin, and the bone marrow’s response is driven by erythropoietin signaling rather than direct hypoxia sensing. This process unfolds over days to weeks as new red cells enter circulation.

When tissues become hypoxic, the kidney acts as the oxygen sensor and ramps up erythropoietin production. Specialized cells in the renal cortex detect the low oxygen tension and increase erythropoietin release, driven by hypoxia-inducible factors. Erythropoietin then travels to the bone marrow and stimulates erythroid progenitor cells to proliferate and mature into red blood cells, boosting hemoglobin and the blood’s oxygen-carrying capacity. In adults, the kidney is the main source of erythropoietin, while the liver’s role is minimal postnatally. The lungs do not produce erythropoietin, and the bone marrow’s response is driven by erythropoietin signaling rather than direct hypoxia sensing. This process unfolds over days to weeks as new red cells enter circulation.

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