What do you call the epithelium that lines body cavities open to the exterior?
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The epithelium that lines body cavities open to the exterior is often referred to as "mucous membrane" or "mucosa."
Mucous membranes are composed of epithelial tissue that lines various body cavities that open to the outside of the body, such as the respiratory, digestive, urinary, and reproductive tracts. These membranes are involved in the production of mucus, which helps protect and lubricate the surfaces, as well as in other functions like absorption and secretion. The specific type of epithelium present in mucous membranes can vary based on the location and function of the particular cavity.