where is peristalsis found in the digestive system
Peristalsis In much of a digestive tract such as the human gastrointestinal tract, smooth muscle tissue contracts in sequence to produce a peristaltic wave, which propels a ball of food (called a bolus while in the esophagus and upper gastrointestinal tract and chyme in the stomach) along the tract. Peristaltic movement comprises relaxation of circular smooth muscles, then their contraction behind the chewed material to keep it from moving backward, then longitudinal contraction to push it forward.
Perineum In human anatomy, the perineum (/pɛrɪˈniːəm/;[1] late Latin, from Greek περίνεος perineos perinaeon, peri-, around + inein to discharge or defecate), is the space between the anus and scrotum in the male and between the anus and the vulva in the female.[2] The perineum is the region of the body between the pubic symphysis (pubic arch) and the coccyx (tail bone), including the perineal /pɛrəˈniːəl/ body and surrounding structures. There is some variability in how the boundaries are defined.[3] The perianal area (peri- and anal) is a subset of the perineum.