Instead, lymph circulates through peristalsis in the lymph capillaries as well as valves in the capillaries, compression during contraction of adjacent skeletal muscle, and arterial pulsation. Sperm
During ejaculation, the smooth muscle in the walls of the vas deferens contracts reflexively in peristalsis, propelling sperm from the testicles to the urethra. Earthworms
The earthworm is a limbless annelid worm with a hydrostatic skeleton that moves by peristalsis. Its hydrostatic skeleton consists of a fluid-filled body cavity surrounded by an extensible body wall. The worm moves by radially constricting the anterior portion of its body, increasing length via hydrostatic pressure. This constricted region propagates posteriorly along the worms body. As a result, each segment is extended forward, then relaxes and re-contacts the substrate, with hair-like setae preventing backward slipping. Various other invertebrates, such as caterpillars and millipedes, also move by peristalsis. Machinery
A peristaltic pump is a positive-displacement pump in which a motor pinches advancing portions of a flexible tube to propel a fluid within the tube. The pump isolates the fluid from the machinery, which is important if the fluid is abrasive or must remain sterile. Robots have been designed that use peristalsis to achieve locomotion, as the earthworm uses it. Related terms
Aperistalsis refers to a lack of propulsion. It can result from achalasia of the smooth muscle involved. Basal electrical rhythm is a slow wave of electrical activity that can initiate a contraction. Catastalsis is a related intestinal muscle process.
Ileus is a disruption of the normal propulsive ability of the gastrointestinal tract caused by the failure of peristalsis. Retroperistalsis, the reverse of peristalsis

References
External links
Interactive 3D display of swallow waves at menne-biomed.de
Peristalsis at the US National Library of Medicine Medical Subject Headings (MeSH)
Nosek, Thomas M. "Section 6/6ch3/s6ch3_9". Essentials of Human Physiology. Archived from the original on 2016-03-24. Overview at colostate.edu