True regarding water absorption in tubules:September 2007
Ans. B: Bulk of water reabsorption occurs secondary to sodium absorptionWater reabsorption keeps pace with the sodium reabsorption in the proximal tubules and hence the concentration of sodium and total osmolarity remains the same.
Majority of facultative reabsorption occurs in proximal tubule
Bulk of water reabsorption occurs secondary to sodium absorption
25% of water is reabsorbed irrespective of water balance
Obligatory reabsorption is ADH dependent