title: Complex clocks.
abstract: Periodic activity of the digestive tract is now a well-recognized phenomenon. Some years ago, it was proposed that this was controlled by a single "clock" at a distance from the gut, but subsequent study has shown that this explanation was inadequate. "Black box" analysis of available data suggests a new model which requires multiple clocks; this model is proposed as being consistent with current knowledge of the system.
mesh_terms: D000818:Animals; D001683:Biological Clocks; D004064:Digestive System / Q000378:metabolism; D004068:Digestive System Physiological Phenomena; D005768:Gastrointestinal Hormones / Q000378:metabolism* / Q000502:physiology; D005769:Gastrointestinal Motility; D006801:Humans; D010455:Peptides / Q000502:physiology; D010507:Periodicity
chemical_list: D005768:Gastrointestinal Hormones; D010455:Peptides