Find out the correct statement about the loop of Henle

Options

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

Answer

To find the correct statement about the loop of Henle, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Nephron**:
- The nephron is the basic functional unit of the kidney, consisting of several parts including the glomerulus, Bowman's capsule, proximal convoluted tubule (PCT), loop of Henle, distal convoluted tubule (DCT), and collecting duct.

2. **Identify the Loop of Henle**:
- The loop of Henle is a U-shaped structure in the nephron that consists of two limbs: the descending limb and the ascending limb.

3. **Analyze the Function of the Descending Limb**:
- The descending limb of the loop of Henle is primarily involved in the reabsorption of water. It is permeable to water but not to electrolytes.

4. **Analyze the Function of the Ascending Limb**:
- The ascending limb, on the other hand, is impermeable to water and is involved in the reabsorption of electrolytes such as sodium and chloride ions.

5. **Evaluate the Given Statements**:
- The first statement claims that the descending limb is permeable to electrolytes, which is incorrect.
- The second statement, which states that the descending limb is permeable to water, is correct.

6. **Conclude the Correct Statement**:
- Based on the analysis, the correct statement about the loop of Henle is that "the descending limb is permeable to water."

### Final Answer:
The correct statement about the loop of Henle is: **The descending limb is permeable to water.**

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