Question

Blood osmolarity decreases with the secretion of 

1. ADH
2. aldosterone
3. angiotensin II
4. ANP

Options

• i and ii only

• ii and iii only

• ii and iv only

• i only

Answer 1

i only

Explanation:

Antidiuretic Hormone (ADH) increases water reabsorption in the kidneys without significantly increasing salt reabsorption. This addition of “pure” water to the bloodstream dilutes the blood, thereby decreasing its overall osmolarity.