The epithelium is one of the basic tissue types. It lines the cavities or covers surfaces of structures throughout the body and also forms many glands. Functions of epithelial cells include protection, secretion, selective absorption, transcellular transport, and detection of sensation.
Epithelia form continuous sheets of cells densely packed together through the presence of numerous specialized intercellular junctions. Tight junctions are specific to epithelia and contribute to their barrier function. Desmosomal and adherens junctions ensure mechanic stability through connections with cytokeratin intermediate filaments specific to epithelia and actin microfilaments of the cytoskeleton.
Epithelia rest on a basement membrane called the...
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