Which of the following statements is correct?

Options

A. The ascending limb of loop of Henle is impermeable to water
B. The descending limb of loop of Henle is impermeable to water
C. The ascending limb of loop of Henle is permeable to water
D. The descending limb of loop of Henle is permeable to electrolytes

Answer

To determine which statement is correct regarding the Loop of Henle, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding the Loop of Henle**: The Loop of Henle is a U-shaped tube in the nephron of the kidney that plays a crucial role in concentrating urine and conserving water.

2. **Analyzing the First Option**:
- The statement claims that the "Ascending Limb of Loop of Henle is impermeable to water."
- This statement is **correct**. The ascending limb does not allow water to pass through but is permeable to ions, particularly sodium and chloride, which are reabsorbed.

3. **Analyzing the Second Option**:
- The statement claims that the "Descending Limb of Loop of Henle is impermeable to water."
- This statement is **incorrect**. The descending limb is actually permeable to water, allowing water to be reabsorbed into the surrounding medullary interstitium.

4. **Analyzing the Third Option**:
- The statement claims that the "Ascending Limb of Loop of Henle is impermeable to water."
- This statement is **correct** but is a repetition of the first option. Thus, it does not provide new information.

5. **Analyzing the Fourth Option**:
- The statement claims that the "Descending Limb of Loop of Henle is impermeable to electrolytes."
- This statement is **incorrect**. The descending limb is primarily permeable to water and does not actively transport electrolytes.

### Conclusion:
After analyzing all the options, the first statement is the correct answer: "The Ascending Limb of Loop of Henle is impermeable to water."