Slime

Mucus is a product of cell secretion , in multicellular organisms it is mainly the epithelial tissue of the mucous membranes . This viscous substance most often consists of glycosaminoglycans , it also often contains some antiseptics (for example, lysozyme ) and immunoglobulins , which serve to protect epithelial cells of the lungs , gastrointestinal tract , genitourinary system , vision and hearing in mammals ; epidermis in amphibians , gills in fish . Snails , slugs and some invertebrates also produce mucus, which, in addition to its protective function (both from the mucous membrane and from predators due to an unpleasant taste), can facilitate movement and play a role in communication.