Hyponyms (each of the following is a kind of lacrimator): chlorobenzylidenemalononitrile; CS gas (a tear gas that is stronger than CN gas but wears off faster; can be deployed by grenades or cluster bombs; can cause skin burns and fatal pulmonary edema)
Freebase(0.00 / 0 votes)Rate this definition: Renin. Renin, also known as an angiotensinogenase, is an enzyme that participates in the body's renin-angiotensin system âalso known as the renin-angiotensin-aldosterone axisâthat mediates extracellular volume, and arterial vasoconstriction.
Renin is a peptide hormone secreted by the kidneys. It functions in the renin-angiotensin system (RAS) which regulates extracellular fluid volume and arteriol blood pressure.As with other peptide hormones, the production and secretion of renin is tightly regulated by physiological processes within the body.fter renin is released from the kidney, it breaks down angiotensinogen into angiotensin I. This peptide is then broken down further into angiotensin II, which acts as a vasoconstrictor narrowing the blood vessels.