<prompt> In infants, defecation often follows a meal. The cause of colonic contractions in this situation isGastroileal reflexEnterogastric reflexIncreased circulating levels of CCKGastrocolic- reflex  <response>: Gastrocolic reflex 511- Ganong 477- Ganong 23rd Distention of the stomach by food initiates contactions of the rectum and , frequently a desire to defecate. The response is called the Gastrocolic reflex Some evidence that it is due an action of gastrin on the colon and is not neurally mediated When food leaves the stomach, the cecum relaxes and the passage of chyme through the ileocecal valve increases Gastroileal reflex. This is presumably a vagal reflex. 