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A tissue is defined as a collection of cells, that is specialized to perform one or more particular function.


Epithelial tissues are animal tissues and form sheets covering surfaces. Two tissues that you need to know about are squamous and ciliated epithelia. Both are one cell thick and so are called simple epithelia. The cells rest on a basement membrane which, is a network of collagen and glycoproteins that is secreted by cells underneath the epithelial tissue.

Squamous epithelia: In this tissue, the cells are of one type and are smooth, flat and very thin. They are packed closely together and provide a low friction surface over which fluids can move. It is found lining the cheeks, inside blood vessels, lining the chambers of the


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