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Which organ is the primary source of circulating erythrop... | QuestionStock

Representative image for question: Which organ is the primary source of circulating erythropoietin (EPO) in adults?

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Medicine

Which organ is the primary source of circulating erythropoietin (EPO) in adults?

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Which organ is the primary source of circulating erythropoietin (EPO) in adults?

Options:

Kidney
Liver
Spleen
Bone marrow

Correct answer: Kidney

Explanation: The kidney produces the majority of systemic EPO via peritubular interstitial fibroblasts; roughly 90% of circulating erythropoietin in adults is renal in origin.

Created 2026-03-10T17:34:39.665Z. Updated 2026-03-10T17:34:39.665Z.