Which of the following statements are correct? A. An excessive loss of body fluid from the body switches off osmoreceptors. B. ADH facilitates water reabsorption to prevent diuresis. C. ANF causes vasodilation. D. ADH causes increase in blood pressure. E. ADH is responsible for decrease in GFR. Choose the correct answer from the options given below:

Solution & Explanation

Answer: (B) B, C and D only. Solution: Evaluating each statement against NCERT: (A) is FALSE — excessive fluid loss ACTIVATES osmoreceptors (it is an increase in body fluid that switches them off). (B) is TRUE — ADH facilitates water reabsorption from the latter parts of the tubule, preventing diuresis. (C) is TRUE — ANF causes vasodilation. (D) is TRUE — ADH's constrictory effect on blood vessels raises blood pressure. (E) is FALSE — by raising blood pressure ADH increases (not decreases) glomerular blood flow and GFR. Hence the correct statements are B, C and D. NCERT Reference: Ch 16, p.212, lines 13-22 and 34 — "ADH facilitates water reabsorption from latter parts of the tubule, thereby preventing diuresis" and "ANF can cause vasodilation". (Note: NTA's printed key marked (a); statement A is incorrect per NCERT — excessive fluid loss ACTIVATES osmoreceptors — so the NCERT-correct answer is (b).)