One effect he describes is that, after taking opium, " The peristaltic Motion of the Intestines becomes more languid.
Peristaltic pumps put a high demand on replacement tubes.
Stimulant and irritant laxatives increase the peristaltic movement of the intestine.
Lactulose may also increase peristaltic action of the intestine.
The third body region or trunk may attain a great length, one or two feet, or even more, and is also muscular, but the truncal muscles are of subordinate importance in locomotion, serving principally to promote the peristaltic contractions of the body by which the food is carried through the gut.