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NaCl which is carried by DL of Vasa rect...

NaCl which is carried by DL of Vasa recta is returned to interstitium of medulla through the wall of

A

AL of Henle's loop

B

DL of Henle's loop`

C

AL of Vasa recta

D

PCT

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The correct Answer is:
To solve the question "NaCl which is carried by the DL of Vasa recta is returned to interstitium of medulla through the wall of?", we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Components**: - The question mentions NaCl (sodium chloride) and the descending limb (DL) of the vasa recta. The vasa recta are capillaries that supply blood to the renal medulla. 2. **Identify the Function of the Vasa Recta**: - The vasa recta plays a crucial role in the countercurrent exchange mechanism, which helps maintain the osmotic gradient in the renal medulla. 3. **Analyze the Options**: - **Option 1: Ascending Limb of Loop of Henle**: This option is incorrect because the ascending limb of the loop of Henle is involved in the reabsorption of NaCl but does not directly return NaCl to the interstitium from the descending limb of the vasa recta. - **Option 2: DL of Loop of Henle**: This option is also incorrect as the descending limb does not return NaCl to the interstitium; it primarily allows for the passage of water. - **Option 3: Ascending Limb of Vasa Recta**: This option is correct. The ascending limb of the vasa recta is responsible for returning NaCl to the interstitium of the medulla. - **Option 4: Proximal Convoluted Tubule (PCT)**: This option is incorrect as the PCT is primarily involved in the reabsorption of various substances but not specifically in the return of NaCl from the vasa recta. 4. **Conclusion**: - Based on the analysis, the correct answer is **Option 3: Ascending Limb of Vasa Recta**. This limb is responsible for returning NaCl to the interstitium of the medulla. ### Final Answer: **The NaCl which is carried by the descending limb of the vasa recta is returned to the interstitium of the medulla through the wall of the Ascending Limb of Vasa Recta.** ---
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