Mucus
From Wikipedia, the free encyclopedia
Mucus is a slippery secretion of the lining of various membranes in the body (mucous membranes). Mucus aids in the protection of the lungs by trapping foreign particles that enter the nose during normal breathing. Additionally, it prevents tissues from drying out.
Mucus is made 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.
In the digestive system, mucus is used as a lubricant for materials which must pass over membranes, e.g., food passing down the esophagus. In the respiratory system, it catches unknown matter and tries to prevent it from entering the body, especially in the nose. In the reproductive system, cervical mucus prevents infection and when thin helps the movement of spermatozoa.
Mucus is a viscous colloid containing antiseptic enzymes (such as lysozyme) and immunoglobulins.
Increased mucus production in the respiratory tract is a symptom of many common diseases, such as the common cold. The presence of mucus in the nose and throat is normal, but increased quantities can impede comfortable breathing and must be cleared by blowing the nose or expectorating phlegm from the throat. Among the components of nasal mucus are tears.
Dried nasal mucus
- Main article: Nasal mucus
Dried nasal mucus (vulgarly or colloquially called "snot", "booger(s)" (US) or "bogey" (UK)) is partially solidified mucus from the nose. Dried nasal mucus forms when the mucus traps dust and other particles in the air. Mucus dries around the particle and hardens, somewhat like a pearl forming in an oyster. Since catching foreign particles is one of the main functions of nasal mucus, the presence of dried nasal mucus is a good indicator of a properly functioning nose.
