What is renin? A. an enzyme released by the juxtaglomerular cells of the kidney when arte- rial pressure falls. B. it catalyses the formation of angiotensin II in the lungs. C. it is a rapid acting, intense vasoconstrictor of arterioles. D. a protein that stimulates the adrenal glands to release aldosterone.
Option A. Renin is an enzyme released by the juxtaglomerular cells of the kidney when arte- rial pressure falls.
