<prompt> Maximum absorption of the water occurs atProximal convoluted tubuleDistal convoluted tubuleCollecting ductLoopofhenle  <response>: Proximal convoluted tubule 802 - Ganong 22th 294- K.S 4th 652- Ganong 23rd In the presence abscence of vasopressin, the greatest fraction of filtered water is absorbed in the proximal convoluted tubules SITE OF REABSORPTIONS1. Substance Reabsorbed from PCT-Glucose, Aminoacid, Na ,K ,Ca ,HCO3 ,Cl- ,PO4, uric acid and water2. Substance Reabsorbed from DCT - Naf ,HCO3 and water3. Substance Reabsorbed from Loop of Henle - Na and Cl- 80-90 of bicarbonate reabsorption occurs in PCT1. Absorption of water in PCT obligatory reabsption i.e. independent of ADH2. Absorption of water in DCT collecting duct facultative - reabsorption i.e. dependent on ADH levels 