What Are Angiotensin Inhibitors And Blockers? by Dr. Harold Gunatillake – Health writer Let’s talk about angiotensin before we discuss its actions in the body. Angiotensin is a hormone secreted by the kidneys, and its main function is to constrict arteries in the body. It has no effect on veins as there are no smooth muscles in them to constrict.When arteries constrict by angiotensin participation the blood pressure will increase. Angiotensin also stimulates the release of another hormone called aldosterone secreted in the adrenal glands sitting on top of the kidneys. To make it a bit more complicated there is another hormone called renin which joins angiotensin and aldosterone to form a system. It is called the renin-angiotensin-aldosterone system (RAAS). This combined system regulates the plasma sodium concentration and the arterial blood pressure. Angiotensin is further converted into angiotensin 11 by an enzyme called angiotensin-converting enzyme (ACE) found in lung ...
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