secretion of exocrine gland mucus CALOHA:TS-2144 NCIT:C13259 GAID:1164 ENVO:02000040 galen:Mucus MESH:D009093 Wikipedia:Mucus UMLS:C0026727 FMA:66938 Mucus is a bodily fluid consisting of a slippery secretion of the lining of the mucous membranes in the body. It is a viscous colloid containing antiseptic enzymes (such as lysozyme) and immunoglobulins. Mucus is produced by goblet cells in the mucous membranes that cover the surfaces of the membranes. It is made up of mucins and inorganic salts suspended in water. bodily fluid