What is angiotensin?

Angiotensin is peptide formed by the action of the enzyme renin on a globulin in blood plasma; renin splits off from its substrate a decapeptide, angiotensin I, which is changed by a converting enzyme to the octapeptide angiotensin II, a potent vasoconstrictor and stimulator of the synthesis and release of the hormone aldosterone; a heptapeptide, angiotensin III, has also been found that is a stimulator of aldosterone synthesis and release but has little or no vasoconstrictor activity.

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