Gall bladder lined by :-

Options

A. Simple columner epi.
B. Stratified columner epi.
C. Brush border columner epi.
D. Brush border cuboidal epi.

Answer

**Step-by-Step Solution:**

1. **Understanding the Gallbladder Structure**: The gallbladder is a small organ that stores bile produced by the liver. It is important to know what type of tissue lines the inner surface of the gallbladder.

2. **Identifying the Epithelium Types**: The options provided are:
- Simple columnar epithelium
- Stratified columnar epithelium
- Brush border columnar epithelium
- Brush border tubular epithelium

3. **Analyzing the Inner Surface**: The inner surface of the gallbladder contains a mucous membrane. This membrane is similar to that found in the small intestine, which suggests a specific type of epithelial tissue.

4. **Recognizing Microvilli**: The cells of the mucous membrane in the gallbladder have microscopic projections called microvilli. These projections increase the surface area for absorption, which is a characteristic feature of certain types of epithelial tissue.

5. **Conclusion on Epithelium Type**: Based on the presence of microvilli and the structure of the epithelium, we conclude that the gallbladder is lined by non-ciliated simple columnar epithelium, which is also referred to as brush border columnar epithelium due to the presence of microvilli.

6. **Final Answer**: Therefore, the gallbladder is lined by brush border columnar epithelium (option 3).

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