You will be given a definition of a task first, then some input of the task.
Given a text passage, come up with an appropriate title for it. The title should accurately represent what the main focus of the passage is. The title of a passage may be present in the first few sentences of the passage and/or be referred to multiple times in the passage. The title should be 1-5 words long.

Mucus ( / mjuks / MEW - kss ) is a slippery aqueous secretion produced by , and covering , mucous membranes . It is typically produced from cells found in mucous glands , although it may also originate from mixed glands , which contain both serous and mucous cells . It is a viscous colloid containing inorganic salts , antiseptic enzymes ( such as lysozymes ) , immunoglobulins , and glycoproteins such as lactoferrin and mucins , which are produced by goblet cells in the mucous membranes and submucosal glands . Mucus serves to protect epithelial cells ( that line the tubes ) in the respiratory , gastrointestinal , urogenital , visual , and auditory systems ; the epidermis in amphibians ; and the gills in fish , against infectious agents such as fungi , bacteria and viruses . The average human nose produces about a liter of mucus per day . Most of the mucus produced is in the gastrointestinal tract .
Output:
Mucus