Question

Which of the following process acts as an antagonist to the Renin-Angiotensin mechanism?

• A. Atrial Natriuretic Factor
• B. ADH action
• C. Micturation
• D. None of the above

Answer 1

The correct option is A Atrial Natriuretic Factor

When blood volume is increased than the normal volume it causes the heart to pump more blood which causes the heart walls to stretch. In response to stretch, the atrial wall releases ANF which acts on the kidney to increase sodium excretion and GFR, to antagonize the activity of Renin-angiotensin aldosterone mechanism. Thus, Renin-Angiotensin mechanism and its antagonist Atrial natriuretic factor act simultaneously to maintain normal blood volume.

So, the correct answer is 'Atrial natriuretic factor'.