peristalsis


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Related to peristalsis: Reverse peristalsis

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

/peri·stal·sis/ (-stahl´sis) the wormlike movement by which the alimentary canal or other tubular organs having both longitudinal and circular muscle fibers propel their contents, consisting of a wave of contraction passing along the tube for variable distances.peristal´tic

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.

peristalsis

[-stal′sis, -stôl′sis]
Etymology: Gk, peri + stalsis, contraction
the coordinated, rhythmic serial contraction of smooth muscle that forces food through the digestive tract, bile through the bile duct, and urine through the ureters.
enlarge picture
Peristalsis

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.

peristalsis

waves of alternate contraction and relaxation in circumferential muscle tissue of a tubular structure, driving contents forward, e.g. movement of blood through the vascular system (see law, Starling's)

peristalsis

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. Increased peristalsis means faster movement of ingesta through the gut and less absorption of fluid, both tending to diarrhea. Reduced peristalsis means a longer alimentary sojourn, greater inspissation of ingesta and a tendency to constipation. See also peristaltic, paralytic ileus.
Enlarge picture
Peristalsis. By permission from Aspinall V, O'Reilly M, Introduction to Veterinary Anatomy and Physiology, Butterworth Heinemann, 2004

reverse peristalsis
peristalsis directed orally is a result of intestinal obstruction and acute, significant distention of the intestinal lumen; it is a major contributing mechanism in vomiting.
References in periodicals archive ?
Intestinal peristalsis weakens because of ganglion cell function loss in distant intestinal canal, which can induce intestinal canal spasm and limit normal physiological activity.
The detection of the proximal edge of the CRF was also difficult because the PUF was so brittle that it was easily crushed into small pieces and mixed with stool on colonic peristalsis.
Achalasia is an uncommon disease originating from the Greek term meaning "does not relax" and, for unknown reasons, causes loss of peristalsis in the distal esophagus and failure of the LES to relax.
The result is a lack of relaxation of the LES, with dilatation and hypertrophy of the proximal portion of the oesophagus and disordered peristalsis in the rest of the oesophagus.
He adds that because men lack women's levels of the female hormone estrogen, which helps the smooth muscle relax, they're more prone to problems with peristalsis, including more urgent or frequent bowel movements.
Sitting upright and not slumping over as you eat also makes a difference because it allows your torso to stretch out, so peristalsis - the involuntary internal muscle movements in the gut - can work more easily.
A rectal probe was inserted and the patient was given prokinetics to facilitate intestinal peristalsis and steroids to reduce the inflammation.
decrease GI peristalsis and increase discomfort and pain
Also, none are highly effective at providing real-time imaging of movement such as peristalsis, which is the contraction of muscles that propels food through the small intestine.
The device creates "a complete bypass," so the food from the stomach goes through the flexible soft liner, driven by peristalsis, and the bile and pancreatic enzymes pass on the outside of the liner, with all mixing in the bowel, said Mr.
Moreover the pain caused by a stone in the ureter is attributed to the acute distention of the renal capsule caused by the obstruction combined with the increased peristalsis of the smooth muscle layer of the ureter.
To inhibit a fuller feeling--the peristalsis of your own smooth muscle, the space around the internal organs: intact or hard.