Peristalsis

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peristalsis

 [per″ĭ-stal´sis]
the wormlike movement by which the alimentary canal or other tubular organs with both longitudinal and circular muscle fibers propel their contents, consisting of a wave of contraction passing along the tube. adj., adj peristal´tic.

When food is swallowed, it passes into the esophagus. Muscular contractions in the wall of the esophagus work the food downward, pushing 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 until the food waste finally reaches the rectum, from which it is periodically discharged from the body. The waves of peristalsis are irregular; they are stronger at some times than at others. They are also weaker in some people, notably the elderly.

Although the normal peristaltic wave is downward, it is sometimes reversed. Reverse peristaltic action may be triggered by mild digestive upsets or more serious disorders, such as an obstruction in the stomach or intestines.

per·i·stal·sis

(per'i-stal'sis),
The movement of the intestine or other tubular structure, characterized by waves of alternate circular contraction and relaxation of the tube by which the contents are propelled onward.
Synonym(s): vermicular movement
[peri- + G. stalsis, constriction]

peristalsis

(pĕr′ĭ-stôl′sĭs, -stăl′-)
n. pl. peristal·ses (-sēz)
The wavelike muscular contractions of the digestive tract or other tubular structures by which contents are forced onward toward the opening.

per′i·stal′tic (-stôl′tĭk, -stăl′-) adj.
per′i·stal′ti·cal·ly adv.

per·i·stal·sis

(per'i-stal'sis)
The movement of the intestine or other tubular structure, characterized by waves of alternate circular contraction and relaxation of the tube by which the contents are propelled onward.
Synonym(s): vermicular movement.
[peri- + G. stalsis, constriction]

peristalsis

A coordinated succession of contractions and relaxations of the muscular wall of a tubular structure, such as the OESOPHAGUS, small intestine or the URETER, producing a wave-like pattern whose effect is to move the contents along.

peristalsis

the alternate contraction and relaxation of circular and longitudinal muscle which produces waves that pass along the intestine (and other tubular systems) of animals, moving the tube contents in one direction.

Peristalsis

A sequence of muscle contractions that progressively squeeze one small section of the digestive tract and then the next to push food along the tract, something like pushing toothpaste out of its tube.
References in periodicals archive ?
Although the contusion improved over next 2-3 days, the swelling increased to 8x10 cm with positive cough impulse and visible peristalsis. The swelling was completely reducible with a palpable defect in abdominal wall.
No visible cough impulse and no visible peristalsis. Swelling was tender with no local rise of temperature and was uniformly soft in consistency, not reducible, not fixed to the overlying skin.