Which hormone produced by the kidneys stimulates the bone marrow to accelerate red blood cell (erythrocyte) production during hypoxia?
Answer and explanation
Correct answer: A. Erythropoietin
- Step 1: When renal tissues detect reduced blood oxygen levels, specialized peritubular interstitial cells secrete erythropoietin (EPO). Step 2. EPO stimulates erythropoiesis in the red bone marrow, raising oxygen-carrying capacity. Answer: Erythropoietin. Why not the others: Aldosterone regulates sodium/potassium balance; ADH controls water reabsorption; thrombopoietin stimulates platelet synthesis.
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