U.S. Postal Inspectors are law enforcement agents, much like police officers and detectives, who maintain the integrity of the U.S. postal system. To become a postal inspector you must be able to fulfill certain duties and meet specific requirements.
epithelial cell, any one of several cells arranged in one or more layers that form part of a covering or lining of a body surface.The cells usually adhere to one other along their edges and surfaces. One surface is free, and the other rests on a noncellular basement membrane.See also epithelial tissue.ny of the cells forming the cellular sheets that cover surfaces, both inside and outside the body. Epithelial cells are closely packed and take on polyhedral shapes, from tall (columnar) through squat (cuboidal) to flat (squamous).
Epithelia are tissues consisting of closely apposed cells without intervening intercellular substances. Epithelia are avascular, but all epithelia grow on an underlying layer of vascular connective tissue. The connective tissue and the epithelium are separated by a basement membrane. Epithelium covers all free surfaces of the body. Epithelium also lines the large internal body cavities, where it is termed mesothelium.