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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- Fall '10