Definition: Angiotensin, a protein that causes blood pressure to rise, is present in many body fluids including urine. The term "angiotensin" comes from Latin for "narrow way," which suggests it's narrow, like the space between cells in the urinary tract (urine system). Angiotensin is known as an "unconjugated" substance; its active form is a concomitant of hormones that include aldosterone and renin.
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