This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Physiology
True about function of Angiotensin ll 
Select and explain. 
A. Constriction of afferrent aeriole, B. Autoregulation of GER, C. Secreted from endothelial, D. Release aldosterone
A: Constriction of afferrent aeriole
Answer: A: Constriction of afferrent aeriole 
Explanation: A vasoactive octapeptide produced by the action of angiotensin-conveing enzyme on angiotensin I; produces stimulation of vascular smooth muscle, promotes aldosterone production, and stimulates the sympathetic nervoussystem.Ref: Ganong&;s review of medical physiology; 24th edition