what are paristytic movements ?

Peristaltic movements are wavelike muscular contractions of the alimentary canal or other tubular structures by which contents are forced onward.

In other words, peristalsis is the rhythmic alternating contraction and relaxation of smooth muscles that forces food through the intestinal tract.

Peristalsis is an automatic and important process that moves food through the digestive system. It also moves urine from the kidneys into the bladder, and bile from the gallbladder into the duodenum. Peristalsis is a normal function of the body.