function of collenchyma,columnar ephitelium,straited muscles
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Epithelium is made up of flat squamous cells, cuboidal cells or columnar cells in single or multiple layers. Epithelial cells are involves in secretion of enzymes, protective substances such as mucus and they provide a supportive function.
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Simple columnar epithelium consist of a single layer of cells that are taller than they are wide. This type of epithelia lines the small intestine where it absorbs nutrients from the lumen of the intestine. Simple columnar epithelia are also located in the stomach where it secretes acid, digestive enzymes and mucous
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