Henle's loop is meant for absorption of:

Options

A. potassium
B. glucose
C. urea
D. Nations

Explanation

To solve the question "Henle's loop is meant for absorption of:", we will analyze the options provided and understand the function of Henle's loop in the nephron of the kidney.

### Step-by-Step Solution:

1. **Understanding Henle's Loop**:
- Henle's loop is a U-shaped portion of the nephron that plays a crucial role in the concentration of urine and the reabsorption of water and salts.

2. **Identifying the Parts of Henle's Loop**:
- The loop consists of two main parts: the descending limb and the ascending limb.
- The descending limb is permeable to water but not to salts, while the ascending limb is impermeable to water and actively transports salts out.

3. **Analyzing the Options**:
- **Potassium ions**: These ions are involved in maintaining ionic balance and are absorbed in the ascending limb of Henle's loop.
- **Glucose**: While glucose is reabsorbed in the nephron, it primarily occurs in the proximal convoluted tubule, not in Henle's loop.
- **Urea**: Urea is a waste product produced by the liver and is not absorbed in Henle's loop.
- **Cations**: This term is too vague without specifying which cation is being referred to.

4. **Conclusion**:
- Based on the functions of Henle's loop and the analysis of the options, the correct answer is **potassium ions**. Henle's loop is specifically involved in the absorption of potassium ions, which helps maintain ionic balance in the body.

### Final Answer:
Henle's loop is meant for the absorption of **potassium ions**.

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