Mucous is produced by specialized cells known as goblet cells and mucous glands. Goblet cells are found in the epithelial lining of organs, such as the intestines and respiratory tract, whereas mucous glands are found in larger structures like the submucosal glands of the bronchi and the salivary glands. These cells and glands secrete mucins, which absorb water to form the gel-like substance known as mucous.
