Which one of the following is not a part of renal pyramid?

Options

A. Peritubular capillaries
B. Convoluted tubules
C. Collecting ducts
D. Loop of Henle

Explanation

To solve the question "Which one of the following is not a part of renal pyramid?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Kidney**:
- The kidney has two main regions: the cortex (outer part) and the medulla (inner part). The renal pyramids are located in the medulla.

2. **Identify the Renal Pyramid**:
- The renal pyramids are conical structures found in the medulla of the kidney. They play a crucial role in the urine formation process.

3. **List the Components of the Renal Pyramid**:
- The components typically associated with the renal pyramids include:
- **Collecting Ducts**: These ducts collect urine from the nephrons.
- **Loop of Henle**: This is part of the nephron that extends into the renal pyramid.
- **Peritubular Capillaries**: These are tiny blood vessels that surround the nephron and are involved in the exchange of substances.

4. **Identify the Options**:
- The question provides options, and we need to determine which one does not belong to the renal pyramid. The options typically include:
- Peritubular capillaries
- Collecting duct
- Loop of Henle
- Convoluted tubules

5. **Analyze Each Option**:
- **Peritubular Capillaries**: Part of the renal pyramid.
- **Collecting Duct**: Part of the renal pyramid.
- **Loop of Henle**: Part of the renal pyramid.
- **Convoluted Tubules**: These are located in the cortex, not in the renal pyramid.

6. **Conclusion**:
- Based on the analysis, the **Convoluted Tubules** are not a part of the renal pyramid. Therefore, the correct answer is the convoluted tubules.

### Final Answer:
The option that is not a part of the renal pyramid is **Convoluted Tubules**.

---