<Tr> <Td> Pseudostratified </Td> <Td> These are simple columnar epithelial cells whose nuclei appear at different heights, giving the misleading (hence "pseudo") impression that the epithelium is stratified when the cells are viewed in cross section . Ciliated pseudostratified epithelial cells have cilia . Cilia are capable of energy dependent pulsatile beating in a certain direction through interaction of cytoskeletal microtubules and connecting structural proteins and enzymes . In the respiratory tract the wafting effect produced causes mucus secreted locally by the goblet cells (to lubricate and to trap pathogens and particles) to flow in that direction (typically out of the body). Ciliated epithelium is found in the airways (nose, bronchi), but is also found in the uterus and Fallopian tubes, where the cilia propel the ovum to the uterus . </Td> </Tr> <P> Cells of epithelial tissue are tightly packed and form a continuous sheet . They have almost no intercellular spaces . All epithelia is usually separated from underlying tissues by an extracellular fibrous basement membrane . The lining of the mouth, lung alveoli and kidney tubules all are made of epithelial tissue . The lining of the blood and lymphatic vessels are of a specialised form of epithelium called endothelium . </P> <P> Epithelium lines both the outside (skin) and the inside cavities and lumina of bodies . The outermost layer of human skin is composed of dead stratified squamous, keratinized epithelial cells . </P> <P> Tissues that line the inside of the mouth, the oesophagus, the vagina, and part of the rectum are composed of nonkeratinized stratified squamous epithelium . Other surfaces that separate body cavities from the outside environment are lined by simple squamous, columnar, or pseudostratified epithelial cells . Other epithelial cells line the insides of the lungs, the gastrointestinal tract, the reproductive and urinary tracts, and make up the exocrine and endocrine glands . The outer surface of the cornea is covered with fast - growing, easily regenerated epithelial cells . A specialised form of epithelium--endothelium forms the inner lining of blood vessels and the heart, and is known as vascular endothelium, and lining lymphatic vessels as lymphatic endothelium . Another type, mesothelium, forms the walls of the pericardium, pleurae, and peritoneum . </P>

The human skin is an example of what class of epithelium tissue
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