Page "Kidney" Paragraph 41
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The kidneys secrete a variety of hormones, including erythropoietin, and the enzyme renin.
Erythropoietin is released in response to hypoxia ( low levels of oxygen at tissue level ) in the renal circulation.
It stimulates erythropoiesis ( production of red blood cells ) in the bone marrow.
Calcitriol, the activated form of vitamin D, promotes intestinal absorption of calcium and the renal reabsorption of phosphate.
Part of the renin-angiotensin-aldosterone system, renin is an enzyme involved in the regulation of aldosterone levels.
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