Brush border is characteristic of

Options

A. Neck of nephron
B. Collecting tube
C. Proximal convoluted tubule
D. All the above

Answer

**Step-by-Step Solution:**

1. **Understanding Brush Border:**
- The term "brush border" refers to a surface that is covered with microvilli, which are tiny, finger-like projections. This structure increases the surface area of the cells, enhancing their ability to absorb substances.

2. **Identifying Where Brush Border is Found:**
- Brush borders are typically found on epithelial cells, specifically in areas where absorption is crucial. In the human body, these are commonly located in the intestines and in certain parts of the nephron.

3. **Examining the Nephron Structure:**
- The nephron is the functional unit of the kidney and consists of two main parts: the renal corpuscle (which includes the Bowman's capsule and glomerulus) and the renal tubule.

4. **Dividing the Renal Tubule:**
- The renal tubule can be further divided into four sections:
- Proximal Convoluted Tubule (PCT)
- Loop of Henle
- Distal Convoluted Tubule (DCT)
- Collecting Ducts

5. **Focusing on the Proximal Convoluted Tubule (PCT):**
- The PCT is where a significant amount of reabsorption occurs, approximately 70% to 80% of the filtrate. This section is lined with cuboidal epithelial cells that have microvilli on their apical surface, forming the brush border.

6. **Conclusion:**
- Given that the brush border is a characteristic feature of the epithelial cells in the PCT, we conclude that the brush border is characteristic of the Proximal Convoluted Tubule.

**Final Answer:**
The brush border is characteristic of the Proximal Convoluted Tubule (PCT).

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