<P> Mucus ( / ˈmjuːkəs / MEW - kəss ) 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 . </P>
<P> Mucus ( / ˈmjuːkəs / MEW - kəss ) 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 . </P>
what role does mucus play in the respiratory system
what role does mucus play in the respiratory system
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
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