Backup of food from the stomach to the esophagus is prevented by the:
A)upper esophageal sphincter
B)lower esophageal sphincter
C)gastric sphincter
D)pyloric sphincter

Question

Quizplus · Accepted Answer

The lower esophageal sphincter is a muscular ring that prevents stomach acid and foods from flowing back into the esophagus. The upper esophageal sphincter prevents air from entering the esophagus during respiration. The gastric sphincter and pyloric sphincter control the flow of food from the stomach to the small intestine.

Backup of Food from the Stomach to the Esophagus Is