what are columnar epithelium tissue?
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Answer:
The columnar epithelium is composed of epithelial cells that are column-shaped. The cell comprising the columnar epithelium is taller than it is wide. Its height is approximately four times its width. The nucleus in each cell is elongated and often found near the base. Some of them may have microvilli at the apical surface. When present, the microvilli increase the surface area (such as during absorption). Cilia may also be present. Ciliated columnar cells aid in the movement of mucus (as seen during mucociliary clearance).
The columnar epithelium may be classified according to the number of layers that make it up. For example, a simple columnar epithelium is one that which is made up of a single layer of columnar epithelial cells.
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