The formation and movement of bolus in medical terms is called peristalsis. It is a process where the smooth muscles in the alimentary canal contract and relax in accordance with the sensory control of the brain. It is involuntary which means that we cannot control this movement. The bolus formed will slowly travel in the esophagus to reach the stomach. It will then convert into a slimy liquid called chyme. The chyme will then pass to the small intestine for the final digestion and absorption of nutrients and water.