noun, Biochemistry.
a proteolytic enzyme secreted by the kidneys that is involved in the release of angiotensin.
a proteolytic enzyme secreted by the kidneys, which plays an important part in the maintenance of blood pressure

renin re·nin (rē’nĭn, rěn’ĭn)
A protein-digesting enzyme that is released by the kidneys and that catalyzes the hydrolysis of angiotensinogen to angiotensin I. Also called angiotensinogenase.
(rē’nĭn, rěn’ĭn)
A proteinase enzyme of high specificity that is released by the kidney and acts to raise blood pressure by activating angiotensin. See also angiotensin.


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