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What are columnar epithelial cells? Ment...

What are columnar epithelial cells? Mention the modifications with its uses.

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1. The columnar epithelium is composed of single layer of tall cells with round to oval nuclei at the base.
2. It lines the digestive tract from the stomach to the rectum.
Modifications :
The two modifications of this lining are the presence of microvilli on the apical surface of the absorptive cells and Goblet cell which secretes the protective lubricating mucus.
Uses: The functions of this epithelium include absorption, secretion of mucus, enzymes and other substances.
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