Question

Which of the following is not a function of angiotensin II?

A. Increases ADH secretion

B. Stimulates vasodilation

C. Increases sympathetic output to the heart

D. Stimulates thirst centers

E. Stimulates aldosterone secretion

Answer 1

• Angiotensinogen is converted into the angiotensin I by the activity of renin.
• Angiotensin I is converted into angiotensin II by the activity of angiotensin converting enzyme secreted from the lungs .
• Angiotensin II increases arterial blood pressure by acting on the blood vessels and causing vasoconstriction.
• It stimulates aldosterone secretion from the adrenal cortex which acts on the renal tubules and increases retension of sodium.This again elevates the blood pressure.
• It increases ADH secretion from hypothalamus.
• It increases the water intake by stimulating the thirst center.
• It increases sympathetic output to the heart.
• Stimulation of vasodilation is not the function of angiotensin II. As it's action on blood vessels causes vasoconstriction.Hence,the answer is option B.