Which of the following shows lower thin and upper thick segment

Options

A. DL of Henel's loop
B. PCT
C. DCT
D. Al of Henle's loop

Answer

To answer the question "Which of the following shows lower thin and upper thick segment?" we need to analyze the options provided: Descending Limb of Loop of Henle, Proximal Convoluted Tubule (PCT), Distal Convoluted Tubule (DCT), and Ascending Limb of Loop of Henle.

### Step-by-Step Solution:

1. **Understanding the Structure of Nephrons**:
- Nephrons are the functional units of the kidney, consisting of a glomerulus and a renal tubule. The renal tubule includes the PCT, Loop of Henle (which has descending and ascending limbs), and DCT.

2. **Identifying the Segments**:
- The Loop of Henle is divided into two main parts: the descending limb and the ascending limb.
- The descending limb is primarily involved in the reabsorption of water, while the ascending limb is involved in the reabsorption of ions.

3. **Analyzing the Ascending Limb of Loop of Henle**:
- The ascending limb has two segments: a thin segment and a thick segment.
- The lower part (thin segment) is permeable to ions but not to water, while the upper part (thick segment) is involved in active transport of ions.

4. **Conclusion**:
- Among the options given, the **Ascending Limb of Loop of Henle** is the correct answer as it has a lower thin segment and an upper thick segment.

### Final Answer:
The structure that shows a lower thin segment and an upper thick segment is the **Ascending Limb of Loop of Henle**.

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