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</html><description>The mucosa, forming a continuous layer that protects the internal membranes from the outside, where the external environment goes into or through the body, as in both the cavities (respiratory system and genital-urinary system) and the intestinal tract. The external skin and the internal mucosa meet at the orifices, forming mucoepithelial membranes.A membrane lining the cavities and canals of the body kept moist by the secretion of mucus.</description></oembed>
