Peristalsis in a healthy stomach

Credit: GASTROLAB/SCIENCE PHOTO LIBRARY

Caption: Peristalsis in a healthy stomach. Endoscopic view of a circular smooth muscle in the stomach starting to contract at the beginning of a peristaltic wave. Peristalsis is the rhythmic contraction of smooth muscles that pushes digested or semi-digested food along the gut. First, circular smooth muscles contract to prevent the material from going the wrong way. Then longitudinal smooth muscles contract to push the food forward.

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