Proximal convoluted tubule (PCT) is lined with

Options

A. cuboidal epithelium
B. columnar epithelium
C. simple squamous brush border epithelium
D. simple cuboidal brush border epithelium

Answer

### Step-by-Step Solution

1. **Understanding the Structure of the Nephron**:
- The nephron is the basic functional unit of the kidney. It consists of various parts including the glomerulus, Bowman’s capsule, proximal convoluted tubule (PCT), loop of Henle, and distal convoluted tubule (DCT).
- The PCT is located immediately after the Bowman’s capsule.

2. **Identifying the Lining of the PCT**:
- The lining of the PCT is crucial for its function, which involves the reabsorption of water, salts, and other substances from the filtrate.
- The epithelial cells lining the PCT are specialized for this reabsorption process.

3. **Types of Epithelial Cells**:
- The options provided include cuboidal epithelium, columnar epithelium, simple squamous epithelium, and simple cuboidal brush border epithelium.
- Among these, the PCT is lined with simple cuboidal epithelium that has microvilli on its surface, often referred to as brush border epithelium.

4. **Function of Brush Border**:
- The presence of microvilli (brush border) increases the surface area of the epithelial cells, enhancing their ability to reabsorb substances from the filtrate effectively.

5. **Conclusion**:
- Based on the structure and function of the PCT, we can conclude that it is lined with **simple cuboidal brush border epithelium**.

### Final Answer
The proximal convoluted tubule (PCT) is lined with **simple cuboidal brush border epithelium**.

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