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): Secretion of Atrial Natriuretic Factor (ANF) causes a decrease in blood pressure. Reason (R): ANF is a peptide hormone that causes constriction of the blood vessels. In the light of the above statements, choose the most appropriate answer from the options given below:
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
C. (A) is true but (R) is false
Step-by-step solution
Assertion (A) is true: The atrial wall of our heart secretes a peptide hormone called Atrial Natriuretic Factor (ANF) in response to increased blood pressure, and its primary function is to decrease blood pressure. Reason (R) is false: ANF decreases blood pressure by causing dilation (widening) of the blood vessels, not constriction. Vasoconstriction would increase blood pressure, which is the opposite of ANF's function. Therefore, (A) is true but (R) is false. Answer: (A) is true but (R) is false