Biology - Digestion and Absorption Question with Solution | TestHub

The opening of the oesophagus into the stomach is guarded by a muscular sphincter called the gastro-oesophageal sphincter or cardiac sphincter.

The pyloric sphincter guards the opening between the stomach and the duodenum.

The sphincter of Oddi guards the opening of the hepatopancreatic duct into the duodenum.

The ileocaecal valve prevents the backflow of faecal matter from the caecum into the ileum.

Answer: Cardiac sphincter