Question

Match the following: A) ADH - I. Vasodilation B) Aldosterone - II. Converts angiotensinogen into angiotensin-I C) Renin - III. Increases water reabsorption D) ANF - IV. Increases $Na^+$ reabsorption

• A. A-III, B-IV, C-II, D-I
• B. A-III, B-II, C-IV, D-I
• C. A-I, B-III, C-II, D-IV
• D. A-III, B-I, C-II, D-IV

Hint:

ADH retains water; Aldosterone retains salt ($Na^+$).

Answer 1

The Correct Option is A

Step 1: What we must match.
We pair four substances that control kidney work and blood pressure with their correct actions.

Step 2: ADH.
ADH (antidiuretic hormone) tells the kidney to take back more water, so less urine is lost. So A goes with III, increases water reabsorption.

Step 3: Aldosterone.
Aldosterone makes the kidney reabsorb more sodium ($Na^+$), and water follows the sodium. So B goes with IV, increases $Na^+$ reabsorption.

Step 4: Renin.
Renin is an enzyme from the kidney that changes angiotensinogen into angiotensin-I, the first step of the renin-angiotensin pathway. So C goes with II.

Step 5: ANF.
ANF (atrial natriuretic factor) comes from the heart when blood pressure is high. It widens blood vessels (vasodilation) to bring pressure down. So D goes with I.

Step 6: Conclusion.
The full match is A-III, B-IV, C-II, D-I, so the correct answer is "A-III, B-IV, C-II, D-I". \[ \boxed{\text{A-III, B-IV, C-II, D-I}} \]