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This information is provided by an independent source. Merck & Co., Inc. is not responsible for this content. Please discuss any and all treatment options with your healthcare professional. The manufacturer of a product generally has the most complete information about that product.

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peristalsis (per″ĭ-stawl´sis) wormlike movements by which tubular organs that have both longitudinal and circular muscle fibers propel their contents; it consists of a wave of contraction passing along the tube. When food is swallowed, it passes into the esophagus, where muscular contractions in the wall work the food downward and push it into the stomach. Here peristaltic contractions not only move the food in small amounts into the intestine but also aid in the disintegration of the food and help mix it with gastric juice. Peristalsis forces the food into and through the intestine for further digestion. adj., peristal´tic., adj.

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