"peristalsis" is a term that refers to the circulation of blood in the blood vessels absorption of food in the intestines mixing and moving of food through the lymphatic system action of the involuntary muscles of the digestive tract breakdown of food in the stomach

Peristalsis refers  to  the   action   of  the  involuntary   muscle  of  the  digestive  track

    Peristalsis  involve  a  series  of  wave  like  muscle  contraction  that  moves  food   to  different  processing  station  in  the   digestive  tracts  and  it  begins in  the  esophagus  when  bolus  of  food  is  swallowed. It  involve involuntary   movement   of    the  longitudinal  and  circular  muscle.