<prompt> Renin is released when:Low phosphateLow sodiumHigh phosphateHigh sodium  <response>: Ans. B. Low sodiumRENIN is an enzyme that is produced and stored in the granules of the juxtaglomerular cells surrounding the afferent arterioles of glomeruli in the kidney. Following stimuli increase its secretion: Sodium depletion Diuretics Hypotension Hemorrhage Upright posture Dehydration Constriction of renal artery or aorta Cardiac failure CirrhosisRenin is a glycoprotein synthesized as a preprohormone. 