Final answer:
The pyloric sphincter regulates the flow of food from the esophagus to the stomach.
Step-by-step explanation:
The pyloric sphincter regulates the flow of food from the esophagus to the stomach. It is located at the distal end of the stomach, just before the entrance to the small intestine. The pyloric sphincter acts as a valve, opening to allow partially digested food (chyme) to pass from the stomach into the small intestine, and closing to prevent the contents of the small intestine from flowing back into the stomach.