What materials would you use for a model of how peristalsis works?

To model peristalsis, you could use a flexible tube to represent the digestive tract, rubber bands or balloons to mimic the muscle contractions, and a viscous fluid like water or gel to simulate the movement of food. Additionally, a pump could be employed to create rhythmic pressure, demonstrating how muscles push contents through the digestive system. This setup effectively illustrates the wave-like motion characteristic of peristalsis.