The columnar epithelium is found in

Options

A. Lining of intestine
B. Lining of blood vessel
C. Seminiferous tubule
D. Uriniferous tubules

Answer

### Step-by-Step Solution:

1. **Understanding Columnar Epithelium**:
- Columnar epithelium is a type of epithelial tissue characterized by a single layer of column-like cells. These cells have a height greater than their width, resembling columns.

2. **Structure of Columnar Epithelium**:
- The free surface of columnar epithelial cells often has microvilli, which are tiny projections that increase the surface area of the cells. This structural feature is crucial for their function.

3. **Functions of Columnar Epithelium**:
- The primary functions of columnar epithelium include absorption and secretion. The increased surface area provided by microvilli enhances these functions.

4. **Locations of Columnar Epithelium**:
- Columnar epithelium is typically found in areas where absorption and secretion occur. Key locations include:
- The inner lining of the alimentary canal (digestive tract).
- The lining of the gallbladder.
- The oviduct (Fallopian tube).

5. **Exclusion of Other Options**:
- Columnar epithelium is not found in:
- Blood vessels (where simple squamous epithelium is present for diffusion).
- Seminiferous tubules (which are involved in spermatogenesis).
- Uriniferous tubules (which are part of the kidney's nephron).

6. **Conclusion**:
- Based on the functions and locations of columnar epithelium, the correct answer to the question about where columnar epithelium is found is in the inner lining of the alimentary canal, gallbladder, and oviduct.

### Final Answer:
Columnar epithelium is found in the inner lining of the alimentary canal, gallbladder, and oviduct.

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