Peristalsis - GCSE Biology Definition

Peristalsis is the wave-like muscle contractions that move food through the digestive system. It occurs in the walls of the digestive tract, such as the oesophagus, stomach, and intestines, where muscles contract and relax to push food along. Peristalsis is important for ensuring that food is properly mixed, broken down, and moved through the digestive system so nutrients can be absorbed. It works continuously, even when you are lying down or upside down, to keep food moving in one direction.