In the presence of vasopressin the greatest fraction of filtered water is reabsorbed in which pa of the nephron?
Proximal tubule
Distal tubule
Loope of Henle
Collecting duct
The proximal tubule is responsible for reabsorbing ~60% of filtered water irrespective of the presence or abscence of vassopressin. Ref: Harrisons principles of internal medicine, 18th edition, chapter: 277.