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Explain the roles of endothelins and nitric oxide in regulating arteriolar diameter.
ScanSolve AI Answer
Let's explain the roles of endothelins and nitric oxide in regulating arteriolar diameter.
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Endothelins (ET) are a group of three peptides (ET-1, ET-2, ET-3) primarily produced in the kidneys, brain, and gastrointestinal tract (GIT). ET-1 is a potent vasoconstrictor (V.C.), meaning it narrows blood vessels. ET-2 and ET-3 are mainly involved in developmental effects.
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Nitric Oxide (NO) is synthesized from the amino acid arginine by the enzyme NO-synthase. NO acts by activating guanylyl cyclase, which then converts GMP into c-GMP. This c-GMP ultimately causes vascular smooth muscle relaxation, leading to vasodilation (V.D.), which widens blood vessels. Beyond vasodilation, NO is also crucial for brain functions and the cytotoxic activity of macrophages. It also plays a key role in penile erection, which is induced by parasympathetic stimulation through its vasodilatory effect.
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