Columnar epithelium is found in

Options

A. Trachea
B. Stomach
C. Lungs
D. Uterus.

Answer

### Step-by-Step Text Solution

1. **Definition of Columnar Epithelium**:
- Columnar epithelium consists of elongated epithelial cells that are taller than they are wide. This type of epithelium is primarily involved in absorption and secretion.

2. **Location of Columnar Epithelium**:
- Columnar epithelium is found in various parts of the body, particularly in areas where absorption and secretion are critical.

3. **Examples of Locations**:
- **Stomach**: Columnar epithelium is predominantly found in the stomach lining. Here, it plays a crucial role in secreting digestive enzymes and gastric juices that aid in digestion.
- **Trachea**: While not purely columnar, the trachea contains pseudostratified columnar epithelium, which helps in trapping and moving particles out of the respiratory tract.
- **Lungs and Uterus**: These areas also contain ciliated columnar epithelium, which has cilia that help in moving substances across the epithelial surface.

4. **Function of Columnar Epithelium**:
- The main function of columnar epithelium is to facilitate absorption of nutrients and secretion of substances, making it essential for digestive processes.

5. **Conclusion**:
- The primary location of columnar epithelium is in the stomach, where it is involved in the secretion of enzymes necessary for digestion.