+A **mucous membrane** is a moist inner lining found in various internal body passages that open to the outside, such as the respiratory or digestive tracts. It secretes [Mucus](/wiki/mucus), a slippery substance that protects underlying [Tissue](/wiki/tissue) from pathogens, dehydration, and mechanical stress, while also aiding in absorption and secretion.
+## See also
+- [Epithelium](/wiki/epithelium)
+- [Skin](/wiki/skin)
+- [Immunity](/wiki/immunity)
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