(redirected from peristaltic)
Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Related to peristaltic: peristaltic movement


see digestive systemdigestive system,
in the animal kingdom, a group of organs functioning in digestion and assimilation of food and elimination of wastes. Virtually all animals have a digestive system. In the vertebrates (phylum Chordata, subphylum Vertebrata) the digestive system is very complex.
..... Click the link for more information.



a wavelike contraction that propels the contents of tubular organs, for example, the intestine, stomach, and ureters, caudally in animals or in a downward direction in man. Peristalsis is the result of many coordinated contractions of the longitudinal and transverse muscles in the walls of a tubular organ. A single peristaltic wave takes the form of a circular constriction around the lumen that moves along the length of the organ. The walls of the organ are always slightly relaxed before the arrival of the constriction, so that the wave appears to push the contents in the direction in which it travels. Peristaltic waves follow each other continuously at a fixed rhythm and rate. In man, for example, the peristaltic rhythm of the stomach is 3 waves/min, with each wave moving at the rate of 0.5 cm/sec; intestinal peristalsis occurs at the rate of 6 waves/min.

Peristalsis is conditioned by the ability of smooth muscles to contract automatically and by the functioning of nerve plexuses in the muscles. The autonomic nervous system and humoral factors regulate peristalsis. Furthermore, the central nervous system, including the cerebral cortex, may participate in the regulation of peristalsis. This was experimentally demonstrated in animals by inducing changes in peristaltic patterns using conditioned reflexes. Observations on humans show that anger and pain inhibit peristalsis, whereas fear sometimes intensifies it; these observations are taken as further evidence that the cortex may have a role in peristaltic control. However, peristalsis is well indicated in isolated parts of the intestine. Medications and the physical and chemical properties of foods also affect peristalsis.


See references under .


The rhythmic progressive wave of muscular contraction in tubes, such as the intestine, provided with both longitudinal and transverse muscular fibers.


Physiol the succession of waves of involuntary muscular contraction of various bodily tubes, esp of the alimentary tract, where it effects transport of food and waste products
References in periodicals archive ?
Qdos peristaltic pumps are designed for dosing with all types of coagulant, regardless of their viscosity, basicity, concentration and flow rate.
In the present study, an analysis of peristaltic motion of a Jeffrey nanofluid in the tapered asymmetric channel under a uniform magnitude field has been made.
The kinematic characteristics of 3DOF peristaltic structure have three input parameters and three output parameters, respectively.
As its primary function is to move liquid effectively, the most important facet of peristaltic pump operation is flow rate, or the amount of fluid that flows over a given time.
Most peristaltic pumps employ velocity control techniques to maintain accuracy.
Independent channel calibration minimizes the tube-to-tube differences resulting in the best calibration accuracy possible in a multichannel peristaltic pump.
This application note describes how using a DOSE-IT peristaltic pump results in 40 percent time-savings compared to a regular pipette controller and at the same time helps to reduce excessive strain caused by this repetitive work.
The AdaptaFil uses the company's peristaltic pump, suitable for Pharmaceutical, Biotech, Diagnostic, and Medical applications where clean/sterile fills are required.
Key statement: An improved fluoroplastic lined elastomeric tube that can maintain a stable flow rate while pumping aggressive chemicals in a peristaltic pump for an extended period of time and is fabricated in sizes ranging from 0.
On filling systems, disposables are normally used in combination with peristaltic pumps.
Cheltenham, United Kingdom, Nov 11, 2010 - (ABN Newswire) - Spirax-Sarco Engineering plc (LON:SPX), the world leader in the control and efficient use of steam and in peristaltic pumping, issues the following Interim Management Statement in respect of the period since 30th June 2010.