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Tissues

Tissues - Term Definition Simple squamous epithelium single...

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Term: Simple squamous epithelium Definition: single layer of flattened cells with disc-shaped central nuclei and sparse cytoplasm, the simplest of the epithelia; allows materials to pass by diffusion and filtration in sites where protection is not important, secretes lubricating substances in serosae; kidney glomeruli, air sacs of lungs, lining of heart, blood vessels, lymphatic vessels, lining of ventral body cavity Term: simple cuboidal epithelium Definition: single layer of cubelike cells with large, spherical central nuclei, secretion and absorption, kidney tubules, ducts and secretory portions of small glands, ovary surface Term: simple columnar epithelium Definition: single layer of tall cells with round to oval nuclei, some cells bear cilia, layer may contain mucous-secreting unicellular glands; absorption, secretion of mucous, ciliated type propels mucous by ciliary action; nonciliated type lines most of the digestive tract, gallbladder, excretory ducts, ciliated ones line small bronchi, uterine tubes
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Term: pseudostratified columnar epithelium Definition: single layer of cells of differing heights, some not reaching the free surface, nuclei seen at different levels, may contain mucous-secreting cells and bear cilia; secretion, particularly of mucous, propulsion of mucous by ciliary action; nonciliated type in male's sperm carrying ducts and large
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