NEETZoologyExcretory Products and their Elimination
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The renin-angiotensin mechanism acts as a check on the Atrial Natriuretic Factor (ANF) mechanism. Reason (R): Secretion of ANF causes vasodilation and thereby decreases the blood pressure, which opposes the effect of Angiotensin II. In the light of the above statements, choose the correct answer fr
Options
- ABoth (A) and (R) are true and (R) is the correct explanation of (A)
- BBoth (A) and (R) are true but (R) is not the correct explanation of (A)
- C(A) is true but (R) is false
- D(A) is false but (R) is true
Correct answer
D. (A) is false but (R) is true
Step-by-step solution
The Assertion (A) is false because it is the Atrial Natriuretic Factor (ANF) mechanism that acts as a check on the renin-angiotensin mechanism, not the other way around. The Reason (R) is true. An increase in blood flow to the atria of the heart causes the release of ANF. ANF causes vasodilation (dilation of blood vessels) and thereby decreases the blood pressure. This directly opposes the vasoconstrictive effect of Angiotensin II, which increases blood pressure. Therefore, (A) is false but (R) is true. Answer: (A)