What is the rhymic contraction of lining gastrointestinal tract called?

The rhymic contraction of the lining gastrointestinal tract is called peristalsis. Peristalsis is a coordinated, involuntary muscle contraction that propels food, liquids, and other substances through the digestive system. It begins in the esophagus and continues through the stomach and intestines. Peristalsis is controlled by the nervous system and is essential for the proper digestion and absorption of food.