Food is pushed down the oesophagus by a series of contractions. The part of the oesophagus just above the ball of food contracts and pushes it down. then it relaxes and the next part of the oesophagus contracts. this wavelike movement, controlled by muscles, is called peristalsis. It occurs all the way down the alimentary canal.
the digestive system more specifically the large intestine
the smooth muscles are responsible for perstalsis and segmentation, so that means its the muscularis externa. :)
Peristalsis is a series of involuntary smooth muscle contractions along the walls of the digestive tract that move food through the digestive tractperistalsis