Q.

The maximum reabsorption of water without the influence of ADH takes place at

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a

proximal convoluted tubule 

b

Henle’s loop

c

distal convoluted tubule

d

collecting duct

answer is A.

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Detailed Solution

Most water reabsorption (65%) takes place in the proximal convoluted tubules, part of the nephrons in the kidney. Water is reabsorbed by a process called osmosis;Solute reabsorption in proximal convoluted tubules promotes osmosis of water.  the diffusion of water from an area of high water potential to an area of low water potential through a partially permeable membrane. 

Conditional reabsorption of Na+ and water takes place in DCT. ADH is the influencing factor at DCT.

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