This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
Action of angiotensin 11 includes 
Select and explain. 
A. Systemic vasodilatation, B. Systemic vasoconstriction, C. Renal vasodilatation, D. Reabsorption of sodium ions in proximal renal tubule
A: Systemic vasodilatation
Answer: A: Systemic vasodilatation 
Explanation: Refer kDT 6/e p 481 The renin-angiotensin system (RAS) plays an impoant role in the regulation of blood pressure. Angiotensin II is the principal effector hormone in the RAS, causing vasoconstriction and increased sodium and water retention, leading to increased blood pressure