A) Renin-angiotensin mechanism decreases the Glomerular Filtration Rate (GFR) while atrial natriuretic factor increase GFR
B) Renin-angiotensin mechanism increase GFR while atrial natriuretic factor decreases GFR
C) Renin-angiotensin mechanism and atrial natriuretic factor both increase the GFR
D) Renin-angiotensin mechanism and atrial natriuretic factor both decrease the GFR
Correct Answer: B
Solution :
Renin Angiotensin mechanism increases the Glomerular Filtration Rate (GFR), while atrial natriuretic factor decreases GFR. A reduced blood pressure causes reduced GFR, result in release of renin by juxta glomerular cells. Renin converts angiotensinogen into angiotensin-II and angiotensin-II. The latter increases the BP by constriction of arterioles and thus increase GFR. ANF is produced by atria of heart and results in decrease blood pressure by reducing\[{{H}_{2}}O\], Na and adipose loads on circulatory system.
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