Vasa rectae are peritubular capillaries around

Options

A. Posterior part of alimentary canal
B. PCT
C. Loop of Henle
D. DCT

Answer

To solve the question about Vasa rectae and their association with peritubular capillaries, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure**: Vasa rectae are specialized peritubular capillaries that are associated with the nephron, specifically in the kidney.

2. **Identify the Nephron Components**: The nephron consists of several parts, including the proximal convoluted tubule (PCT), loop of Henle, distal convoluted tubule (DCT), and collecting duct.

3. **Locate the Vasa Recta**: Vasa rectae are specifically associated with the loop of Henle. They run parallel to the loop and play a crucial role in maintaining the concentration gradient in the renal medulla.

4. **Evaluate the Options**:
- a. Posterior part of the alimentary canal: This is not related to the nephron.
- b. PCT: While there are peritubular capillaries around the PCT, they are not referred to as Vasa rectae.
- c. Loop: This is the correct answer, as Vasa rectae are indeed associated with the loop of Henle.
- d. TCT: Similar to PCT, there are peritubular capillaries around the DCT, but they are not called Vasa rectae.

5. **Conclude the Answer**: Based on the understanding that Vasa rectae are peritubular capillaries surrounding the loop of Henle, the correct answer is option C.

### Final Answer:
**Option C: Loop**

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