The reabsorption of Na⁺ and water together occurs in

Question

Question

This question was previously asked in

UP TGT Biology 2011 Official Paper

Answer 1

Concept-

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A nephron is divided into the following regions-
- Bowman's capsule- The first step of urine formation is filtration which is done by glomerulus present in bowman's capsule.
- Proximal convoluted tubule (PCT)- Nearly all the essential nutrients and 70%-80% of electrolytes and water are reabsorbed by PCT.
- Loop of Henle- This hairpin-like loop has a descending limb, followed by an ascending limb.
- Distal convoluted tubule (DCT)- The DCT of different nephrons opens into a straight tube called a collecting duct.

Explanation-

In the presence of aldosterone hormone in DCT salt (Na⁺) are reabsorbed actively.
Due to the presence of ADH in DCT water is reabsorbed passively.

Thereby Conditional reabsorption of Na⁺ and water takes place in DCT.

Additional Information

Reabsorption of HCO^-₃ occurs in DCT.
Reabsorption of water occurs in descending limb of the loop of Henle.
Reabsorption of electrolytes occurs in ascending limb of the loop of Henle.