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Epithelial tissues Epithelia are the linings of internal and external surface and body cavities, including ducts carrying secretion from glands. They are composed of several layers of cells called epithelia or just a single layer known as simple epithelia. The lowest or the bottom layers of cells are attached to a basement membrane for support and connection. The basement membrane is secreted by the epithelial cells. There are nerve supplies to epithelia but they are supplied with oxygen and nutrients from deeper tissues by diffusion. As they are surface tissues and exposed to fraction, their capacity for growth and repair is grater than other tissues and usually occurs during sleep. Simple epithelia Simple epithelia serve many roles in various body locales. As components of serous and synovial membranes, simple epithelia secrete fluids that lubricate tissues to minimize friction as organs or other body structures rub against one another. Other simple epithelia line...

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