Which of the following statement regarding water reabsorption in the tubules?: (A) The bulk of water reabsorption occurs secondary to Na+ reabsorption, (B) Majority to facultative reabsorption occurs in proximal tubule, (C) Obligatory reabsorption in ADH dependent., (D) 20% of water is always reabsorbed irrespective of water balance
Answer is A. Water reabsorption occurs along with sodium reabsorption.Ref: Ganong&;s review of medical physiology; 24th edition; page no: 685