Along with peristalsis, the lower esophageal sphincter relaxes. Through intestinal muscles, the motor neurons control peristalsis and churning of intestinal contents. Bisacodyl works by stimulating enteric nerves to cause peristalsis, i.e., colonic contractions. Glycerol is a specific bowel mucosa irritant serving to induce peristalsis via a hyperosmotic effect. Food is moved down the gut by muscular contractions called peristalsis. The food bolus is moved along the gut by waves of muscular contractions (peristalsis). Humans drink by swallowing, completed by peristalsis in the esophagus. It does this through regular contractions called peristalsis. The vagus nerve plays the primary role in initiating peristalsis. Side effects include increased peristalsis and diarrhea. This layer is responsible for the rhythmic contraction, called peristalsis, of the Fallopian tubes. These enzymes are absorbed whilst peristalsis occurs. Underlying the process is muscle movement throughout the system through swallowing and peristalsis. Some species burrow by means of muscular peristalsis, and have powerful muscles. The earthworm is a limbless annelid worm with a hydrostatic skeleton that moves by peristalsis.