Neuroscience

Study finds unexpected protective properties of pain

Pain has been long recognized as one of evolution's most reliable tools to detect the presence of harm and signal that something is wrong—an alert system that tells us to pause and pay attention to our bodies.

Immunology

New immune system discovered

(Medical Xpress)—A research team, led by Jeremy Barr, a biology post-doctoral fellow, unveils a new immune system that protects humans and animals from infection.

Medical research

Gut microbe battles obesity

(Medical Xpress)—Akkermansia muciniphila is one of the many microbes that live in our intestines. This bacterium, which feeds on the intestine's mucus lining, comprises between 3 and 5 percent of the gut microbes of healthy ...

Diseases, Conditions, Syndromes

Study linking mucus plugs and COPD mortality could help save lives

A retrospective analysis of patient data from the COPDGene study suggests that targeting mucus plugs could help prevent deaths from chronic obstructive pulmonary disease—the fourth leading cause of death in the United States

Medical research

Acids help against airborne viruses, finds interdisciplinary study

A new study by various Swiss universities, including EPFL, shows that aerosols in indoor air can vary in acidity. This acidity determines how long viruses such as influenza and SARS-CoV-2 remain infectious in the air—with ...

Medical research

How the small intestine defends itself against bacteria

Researchers at the University of Gothenburg have been studying the mucus involved in defending the intestines and airways against infection for more than 30 years. To date, their work has focused very much on the large intestine, ...

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Mucus

In vertebrates, mucus (adjectival form: "mucous") is a slippery secretion produced by, and covering, mucous membranes. Mucous fluid is typically produced from mucous cells found in mucous glands. Mucous cells secrete products that are rich in glycoproteins and water. Mucous fluid may also originate from mixed glands, which contain both serous and mucous cells. It is a viscous colloid containing antiseptic enzymes (such as lysozyme), immunoglobulins, inorganic salts, proteins such as lactoferrin, and glycoproteins known as mucins that are produced by goblet cells in the mucous membranes and submucosal glands. This mucus serves to protect epithelial cells in the respiratory, gastrointestinal, urogenital, visual, and auditory systems in mammals; the epidermis in amphibians; and the gills in fish. A major function of this mucus is to protect against infectious agents such as fungi, bacteria and viruses. The average human body produces about a litre of mucus per day.

Bony fish, hagfish, snails, slugs, and some other invertebrates also produce external mucus. In addition to serving a protective function against infectious agents, such mucus provides protection against toxins produced by predators, can facilitate movement and may play a role in communication.

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