The sphincter that controls the passage of food from the stomach into the duodenum is the

Explanation

The pyloric sphincter opens periodically to release small squirts of chyme into the duodenum, so that the acid can be neutralised and the food digested a little at a time rather than flooding through. The cardiac sphincter guards the entrance from the oesophagus, and its weakness causes heartburn as acid rises. The ileocaecal sphincter lies between the small and large intestines.