NEETZoologyChemical Coordination and Integration
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 acts as a check on the renin-angiotensin mechanism. Reason (R): Increased atrial blood flow causes the release of Atrial Natriuretic Factor (ANF) which leads to vasodilation and decreases blood pressure. In the light of the above statements, choos
Options
- ABoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
- BBoth Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
- CAssertion (A) is true but Reason (R) is false.
- DAssertion (A) is false but Reason (R) is true.
Correct answer
A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
Step-by-step solution
Both Assertion and Reason are true, and Reason is the correct explanation of Assertion. The renin-angiotensin mechanism operates to increase blood pressure and glomerular filtration rate (GFR) through vasoconstriction and sodium reabsorption. When blood pressure or blood flow to the atria of the heart increases, it triggers the release of Atrial Natriuretic Factor (ANF). ANF causes vasodilation (dilation of blood vessels), which decreases blood pressure. Therefore, the ANF mechanism acts as a physiological check on