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Encyclopedia > Migrating motor complex

Migrating motor complexes are waves of activity which sweep through the intestines in a regular cycle during fastening state.

 These motor complexes help trigger peristaltic waves which facilitate transportation of indigestible substances such as bone, fiber and foreign bodies from the stomach, through the small intestine past the ileocecal sphincter into the colon. The MMC originates in the stomach roughly every 75-90 minutes during the interdigestive phase (between meals) and is responsible for the rumbling experienced when hungry. It also serves to transport bacteria from the small intestine to the large, and to inhibit the migration of colonic bacteria into the terminal ileum. 

The MMC is thought to be partially regulated by motilin which is initiated in the stomach as a response to vagal stimulation , and does not depend on extrinsic nerves directly. In much of the digestive tract, muscles contract in sequence to produce a peristaltic wave which forces food (called bolus while in the esophagus and chyme below the esophagus) along the alimentary canal. ... In anatomy, the stomach (in ancient Greek στόμαχος) is an organ of the gastrointestinal tract involved in the second phase of digestion, following mastication. ... In biology the small intestine is the part of the gastrointestinal tract (gut) between the stomach and the large intestine. ... In the anatomy of the digestive system, the colon (> Greek ) is the part of the intestine from the caecum to the rectum. ... Phyla Actinobacteria Aquificae Chlamydiae Bacteroidetes/Chlorobi Chloroflexi Chrysiogenetes Cyanobacteria Deferribacteres Deinococcus-Thermus Dictyoglomi Fibrobacteres/Acidobacteria Firmicutes Fusobacteria Gemmatimonadetes Lentisphaerae Nitrospirae Planctomycetes Proteobacteria Spirochaetes Thermodesulfobacteria Thermomicrobia Thermotogae Verrucomicrobia Bacteria (singular: bacterium) are unicellular microorganisms. ... In biology the small intestine is the part of the gastrointestinal tract (gut) between the stomach and the large intestine. ... The large intestine is the last part of digestive system: the final stage of the alimentary canal in vertebrate animals. ... Motilin is a polypeptide hormone secreted by the small intestine that increases gastrointestinal motility and stimulates the production of pepsin. ...

Reference: Color Atlas of Physiology, 5th ed., Despopoulos, p. 240



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