Q.

Which of the following is antgonistic to RAAS in action?

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a

Angiotensin II

b

ANF

c

Aldosterone

d

ADH

answer is C.

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Detailed Solution

The renin-angiotensin-aldosterone system (RAAS) is involved in increasing the blood pressure when there is fall in it. Its main components include renin, angiotensin II, and aldosterone. ANF, on the other hand, has actions that counteract those of the RAAS. It is released by cells in the atria of the heart in response to increased blood volume and pressure. ANF acts to promote natriuresis (excretion of sodium in the urine), leading to decreased blood volume and blood pressure. Additionally, ANF inhibits the secretion of renin, which is the initial step in the activation of the RAAS.

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