Epithelial Tissue

Epithelial Tissue - Functions of epithelial cells include...

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Epithelial Tissue Epithelial tissue covers body surfaces and lines body cavities. Functions include lining, protecting, and forming glands. Three types of epithelium occur: Squamous epithelium is flattened cells. Cuboidal epithelium is cube-shaped cells. Columnar epithelium consists of elongated cells. Any epithelium can be simple or stratified. Simple epithelium has only a single cell layer. Stratified epithelium has more than one layer of cells. Pseudostratified epithelium is a single layer of cells so shaped that they appear at first glance to form two layers.
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Unformatted text preview: Functions of epithelial cells include: • movement materials in, out, or around the body. • protection of the internal environment against the external environment. • Secretion of a product. Glands can be single epithelial cells, such as the goblet cells that line the intestine. Multicellular glands include the endocrine glands . Many animals have their skin composed of epithelium. Vertebrates have keratin in their skin cells to reduce water loss. Many other animals secrete mucus or other materials from their skin, such as earthworms do....
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