When the gastroesophageal sphincter contracts food?

When the gastroesophageal sphincter contracts, it closes off the esophagus from the stomach, preventing the backflow of gastric contents into the esophagus. This contraction allows food to pass into the stomach while protecting the esophagus from acidic gastric juices. Proper functioning of this sphincter is essential for digestion and preventing conditions like acid reflux. If it doesn't contract effectively, it can lead to discomfort and other digestive issues.