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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): An increase in blood flow to the atria of the heart causes a further increase in blood pressure. Reason (R): The atria of the heart secrete Atrial Natriuretic Factor (ANF) which causes vasodilation and acts as a check on the renin-angiotensin mechanism. In the light of the above statements, choose

Options

  1. ABoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)
  2. BBoth Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)
  3. CAssertion (A) is true but Reason (R) is false
  4. DAssertion (A) is false but Reason (R) is true

Correct answer

D. Assertion (A) is false but Reason (R) is true

Step-by-step solution

An increase in blood flow to the atria of the heart triggers the release of Atrial Natriuretic Factor (ANF). ANF causes vasodilation (dilation of blood vessels) and thereby decreases the blood pressure, rather than increasing it. Therefore, Assertion (A) is false. The Reason (R) is a correct statement because ANF acts antagonistically to the renin-angiotensin mechanism, serving as a check on it by promoting vasodilation and reducing blood pressure. Answer: Assertion (A) is false but Reason (R) is true

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