Loop of Henle takes part in absorption of

Options

A. Potassium
B. Glucose
C. Water
D. Urea

Answer

### Step-by-Step Solution:

1. **Understanding the Nephron**:
- The nephron is the functional unit of the kidney responsible for filtering blood and forming urine. It consists of several parts, including the glomerulus, proximal convoluted tubule (PCT), loop of Henle, distal convoluted tubule (DCT), and collecting duct.

2. **Identifying the Loop of Henle**:
- The loop of Henle is a U-shaped structure that connects the PCT to the DCT. It plays a crucial role in the concentration of urine.

3. **Function of the Loop of Henle**:
- The primary function of the loop of Henle is to create a concentration gradient in the medulla of the kidney, which is essential for the reabsorption of water and salts.

4. **Analyzing the Options**:
- The question provides four options: potassium, water, glucose, and urea. We need to determine which substance is primarily absorbed in the loop of Henle.
- Potassium: While some potassium is reabsorbed in the nephron, it is not the main function of the loop of Henle.
- Water: The loop of Henle is specifically involved in the reabsorption of water, particularly in the descending limb, where it is permeable to water.
- Glucose: Glucose is primarily reabsorbed in the PCT, not the loop of Henle.
- Urea: Urea is not significantly reabsorbed in the loop of Henle; it is more relevant to the collecting duct.

5. **Conclusion**:
- Based on the functions of the loop of Henle and the analysis of the options, the correct answer is **water**. The loop of Henle plays a significant role in the absorption of water, which helps concentrate the urine.

### Final Answer:
The loop of Henle takes part in the absorption of **water**.

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