`Na^(+)` and `Cl'` are absorbed in kideny in the region of

Options

A. Ascending limb of Henle's loop
B. Descending limb of Henle's loop
C. DCT
D. PCT

Answer

To solve the question regarding where sodium (Na⁺) and chloride (Cl⁻) ions are absorbed in the kidney, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Nephron**: The nephron is the functional unit of the kidney, consisting of various parts including the proximal convoluted tubule (PCT), loop of Henle (which has descending and ascending limbs), and distal convoluted tubule (DCT).

2. **Identify the Function of Each Region**:
- **Proximal Convoluted Tubule (PCT)**: Primarily responsible for the reabsorption of a significant amount of sodium, chloride, water, bicarbonate, and potassium.
- **Loop of Henle**:
- **Descending Limb**: Permeable to water but not to ions; primarily involved in water reabsorption.
- **Ascending Limb**: Impermeable to water but permeable to ions; responsible for the reabsorption of sodium and chloride ions.
- **Distal Convoluted Tubule (DCT)**: Involved in the reabsorption of sodium, chloride, and bicarbonate, along with some water.

3. **Analyze the Options**:
- **Ascending Limb of Henle's Loop**: This region is known for reabsorbing sodium and chloride ions (NaCl) while being impermeable to water.
- **Descending Limb of Henle's Loop**: This area reabsorbs water but not ions, making it unsuitable for Na⁺ and Cl⁻ absorption.
- **DCT**: While it does reabsorb Na⁺ and Cl⁻, it is not the primary site for their absorption compared to the ascending limb.
- **PCT**: Also reabsorbs Na⁺ and Cl⁻, but again, the question specifically asks for the region where absorption is most significant for these ions.

4. **Conclusion**: Based on the functions of each part of the nephron, the ascending limb of the loop of Henle is the primary site for the absorption of sodium and chloride ions.

### Final Answer:
The correct answer is **Ascending Limb of Henle's Loop**.

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