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Mucous glands are small glands found on the mucous membrane that lines many passages in the body, particularly the digestive and respiratory tracts. These glands produce mucus, a viscous fluid composed of water, cells, and salts, which serves to moisten, lubricate, and protect these surfaces.1

In the digestive system, mucous cells in the mouth keep food moist, while in the stomach, a thick layer of mucus protects the organ from its own acidic digestive juices. The term "mixed gland" refers to a gland that produces more than one type of secretion, with mucoserous glands being an example.12

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