What regulates the exit of partially digested food from the stomach?

pyloric sphincter

Explanation:

The upper and lower oesophageal sphincters. The lower sphincter, or cardiac sphincter, at the upper portion (cardia) of the stomach. This sphincter prevents the acidic contents of the stomach from moving upward into the esophagus. The pyloric sphincter, at the lower end of the stomach, regulates the exit of the partially digested food out of the stomach.