Epithelial tissue, also called epithelium (from the Greek epi, meaning “on,” and thele, meaning “nipple”), covers every surface, both
external and internal, of the body. The outer layer of the skin, the epidermis,
is one example of epithelial tissue. Other examples of epithelial tissue are
the lining of the lungs, kidney tubules, and the inner surfaces of the
digestive system, including the esophagus, stomach, and intestines. Epithelial
tissue also includes the lining of parts of the respiratory system.
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