Give the location of columnar epithelium

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Columnar Epithelium**: Columnar epithelium consists of a single layer of cells that are taller than they are wide. This unique shape allows them to perform specific functions effectively.

2. **Location in the Body**:
- **Small Intestine**: Columnar epithelial cells are primarily found lining the small intestine. Here, they play a crucial role in the absorption of nutrients from the lumen of the intestine.
- **Stomach**: They are also present in the stomach, where simple columnar epithelium secretes various substances, including digestive enzymes, mucus, and acids.
- **Respiratory System**: In the respiratory system, a specialized form known as pseudostratified columnar epithelium (which may have cilia) is found. This type helps in transporting mucus upwards to keep the airways clear.
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