Given below are two statements. One is labelled as Assertion A and the other labelled as Reason R.
Assertion (A) : A fall in glomerular blood flow/glomerular blood pressure can activate the JG cells to release renin.
Reason (R) : Atrial natriuretic factor can cause vasodilation and thereby decrease blood pressure.
In light of the above statements, choose the most appropriate answer from the options given below.

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Both A and R are correct but R is not the correct explanation of A.

A is correct but R is not correct.

A is not correct but R is correct.

Both A and R are correct and R is the correct explanation of A.

answer is A.

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Detailed Solution

Both A and R are correct but R is not the correct explanation of A.

A fall in glomerular blood flow or glomerular blood pressure can activate the juxtaglomerular (JG) cells to release renin. Renin, in turn, initiates the renin-angiotensin-aldosterone system (RAAS), leading to vasoconstriction and an increase in blood pressure.
Atrial natriuretic factor (ANF) does indeed cause vasodilation, resulting in a decrease in blood pressure. ANF is secreted by the heart's atria in response to increased blood volume and pressure, serving as a counter-regulatory mechanism to reduce blood pressure.

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