The process by which food within the small intestine is mixed with digestive juices backward and forward movement across internal wall of organ called?

The process by which food within the small intestine is mixed with digestive juices through backward and forward movement across the internal wall of the organ is called peristalsis. This rhythmic contraction and relaxation of muscles in the small intestine helps to mix the food with digestive enzymes, facilitating the process of digestion and absorption of nutrients.