Physiology In the presence of vasopressin the greatest fraction of filtered water is reabsorbed in which pa of the nephron? A Proximal tubule B Distal tubule C Loope of Henle D Collecting duct 💡 Explanation In the presence of vasopressin the greatest fraction of filtered water is reabsorbed in which pa of the nephron? ✓ Correct Answer: A. Proximal tubule