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|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
angiotensin an·gi·o·ten·sin (ān'jē-ō-těn'sĭn)
Any of a group of peptides with vasoconstrictive activity that function physiologically in controlling arterial pressure.
|angiotensin (ān'jē-ō-těn'sĭn) Pronunciation Key
Any of three polypeptide hormones that function in the body in controlling arterial pressure. The most important is known as angiotensin II, a powerful vasoconstrictor that stimulates steroid production by the adrenal glands, reduces fluid loss from the kidneys, and also functions as a neurotransmitter. Angiotensin II is formed from inactive angiotensin I by the action of angiotensin-converting enzyme (or ACE). See also ACE inhibitor, renin.