What term refers to the junction between the small and large intestine?

• A. Pyloric sphincter
• B. Ileocecal valve
• C. Sphincter of Oddi
• D. Cardia

Answer: (B)

The junction between the small and large intestine is the ileocecal valve. This valve sits where the end of the ileum meets the beginning of the cecum and acts as a sphincter to regulate the flow of chyme from the small intestine into the large intestine while preventing backflow from the colon into the ileum. Keeping this passage under control helps coordinate digestion and absorption and maintains separate microbial environments in the two sections of the gut. The other structures are located in different regions: the pyloric sphincter sits between the stomach and the duodenum; the Sphincter of Oddi controls bile and pancreatic juice entry into the duodenum; and the cardia is the part of the stomach where the esophagus meets the stomach.