What is the role of the ileocecal valve?

• A. It secretes bile into the duodenum
• B. It controls passage from ileum to cecum and prevents backflow from colon to ileum
• C. It digests fats with lipase
• D. It absorbs vitamins

Answer: (B)

The main idea being tested is how a one-way valve regulates movement and protects different parts of the digestive system. The ileocecal valve sits between the end of the ileum and the start of the cecum and acts as a gate that controls when chyme moves from the ileum into the large intestine. Its key role is to allow a controlled flow from the ileum to the cecum while preventing contents of the colon from moving back into the ileum. This helps protect the delicate environment of the small intestine and maintains proper digestion and absorption.

The other options describe functions not performed by this valve: secreting bile into the duodenum is a job of the biliary system, not a valve; digesting fats with lipase is done by digestive enzymes like lipase, not by a valve; absorbing vitamins happens across the intestinal lining, not by the valve itself.