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Line 3: [[File:Peristaltic.jpg\|thumb\|A time-space diagram of a peristaltic wave after a water swallow. High-pressure values are red, zero pressure is blue-green. The ridge in the upper part of the picture is the high pressure of the upper esophageal sphincter which only opens for a short time to let water pass.]] '''Peristalsis''' ({{IPAc-en\|US\|p\|ˌ\|ɛ\|ɹ\|ɪ\|s\|t\|ˈ\|æ\|l\|s\|ɪ\|s}} {{respell\|pair\|əih\|STALL\|sis}}) is a [[symmetry in biology#Radial symmetry\|radially symmetrical]] contraction and relaxation of [[muscle]]s that propagates in a [[wave]] down a tube, in an [[wikt:anterograde\|anterograde]] direction. Peristalsis is progression of coordinated contraction of involuntary circular muscles, which is preceded by a simultaneous contraction of the longitudinal muscle and relaxation of the circular muscle in the lining of the gut.<ref>{{Cite book\|last=Mittal\|first=Ravinder K.\|url=https://www.ncbi.nlm.nih.gov/books/NBK54265/\|title=Peristalsis in the Circular and Longitudinal Muscles of the Esophagus\|date=2011\|publisher=Morgan & Claypool Life Sciences\|language=en}}</ref> In much of a [[digestive tract]] such as the [[human gastrointestinal tract]], [[smooth muscle tissue]] contracts in sequence to produce a peristaltic wave, which propels a ball of [[food]] (called a [[bolus (digestion)\|bolus]] before being transformed into [[chyme]] in the stomach) along the tract. The peristaltic movement comprises relaxation of circular smooth muscles, then their contraction behind the chewed material to keep it from moving backward, then longitudinal contraction to push it forward.

Peristalsis: Difference between revisions