Is the involuntary movement of the muscles that move food through the digestive system.

Peristalsis is the involuntary movement of the muscles that move food through the digestive system.

Explanation:

Peristalsis is a reflex response.It is initiated when the gut wall is stretched by the contents of the lumen.Peristalsis occurs in all parts of the gastrointestinal tract from esophagus to the rectum.It actually refers to the ringlike contraction of the circular smooth muscle that move progressively forward pushing the bolus.It involves coordinated contraction and relaxation above and below the food bolus so that the bolus is pushed forward instead of being pushed back.