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

Options

A. Peritubular cappillaries
B. Loops of Henle
C. Collecting ducts
D. Convoluted tubeles

Answer

To solve the question "Which one of the following is not a part of a renal pyramid?", we need to analyze the options provided and understand the anatomy of the kidney, specifically the renal pyramids.

### Step-by-Step Solution:

1. **Understand the Structure of the Kidney**:
- The kidney is divided into two main regions: the cortex and the medulla. The medulla contains structures known as renal pyramids.

2. **Identify the Components of Renal Pyramids**:
- Renal pyramids are conical structures located in the medulla of the kidney. They contain several important components:
- **Peritubular Capillaries**: These are tiny blood vessels that surround the nephron tubules and are involved in the exchange of substances.
- **Loops of Henle**: These are parts of the nephron that extend into the medulla and play a crucial role in urine concentration.
- **Collecting Ducts**: These ducts collect urine from the nephrons and transport it to the renal pelvis.

3. **Analyze the Options**:
- **Option 1: Peritubular Capillaries** - Part of the renal pyramid.
- **Option 2: Loops of Henle** - Part of the renal pyramid.
- **Option 3: Collecting Ducts** - Part of the renal pyramid.
- **Option 4: Convoluted Tubules** - These are located in the cortex of the kidney, not in the renal pyramids.

4. **Conclusion**:
- The component that is **not a part of the renal pyramid** is the **Convoluted Tubules**. Therefore, the correct answer is **Option 4**.

### Final Answer:
**Convoluted Tubules** (Option 4) is not a part of a renal pyramid.

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