Answer the following :
State the function of ciliated columnar epithelium in the respiratory tract.

Explanation

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

1. **Understanding Epithelial Tissue**: Epithelial tissue is a type of tissue that covers the surfaces of the body and lines cavities and organs. It has a free surface that can face body fluids or the external environment.

2. **Identifying Columnar Epithelium**: Columnar epithelium consists of a single layer of tall and slender cells. This type of epithelium can have structures called microvilli on its surface, which increase the surface area for absorption and secretion.

3. **Ciliated Columnar Epithelium**: In some columnar epithelial cells, cilia are present on the free surface. Cilia are hair-like structures that can move in a coordinated manner.

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