Physiology – MCQ 67 – Water absorption in tubules

Which one of the following statements is true regarding water reabsorption in the tubules?
A. The bulk of water reabsorption occurs secondary to Na reabsorption.
B. Majority of facultative reabsorption occurs in proximal tubule
C. Obligatory reabsorption is ADH dependent
D. 20% of water is always reabsorbed irrespective of water balance

Correct answer : A. The bulk of water reabsorption occurs secondary to Na reabsorption.

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