Given below are two statements. One is labelled Assertion (A) and the other is labelled Reason (R).
Assertion (A): Atrial natriuretic factor decreases blood pressure.
Reason(R): Atrial natriuretic factor is a peptide hormone.
In light of the above statements, choose the correct answer from the options given below

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Both (A) and (R) are true and (R) is the correct explanation of (A).

(A) is false but (R) is true

(A) is true but (R) is false.

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

answer is B.

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Detailed Solution

The assertion (A) is true. The atrial natriuretic factor is a hormone produced by the heart in response to stretching of the atria, and it acts to reduce blood pressure by promoting vasodilation and increasing the excretion of sodium and water by the kidneys, thus reducing blood volume.

The reason (R) is also true. The atrial natriuretic factor is a peptide hormone, specifically a polypeptide composed of 28 amino acids.

The reason just describes the chemical nature of ANF but does not directly explain why atrial natriuretic factor decreases blood pressure.

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