Which sphincter prevents reflux of digested material from the colon into the small intestine?
a. Haustral
b. Lower esophageal
c. Pyloric
d. Ileocecal valve
ANS: D
The ileocecal valve prevents reflux of digested material from the colon into the small intestine. The haustral segments facilitate propulsion; they do not prevent reflux. Lower esophageal pre-vents reflux from the stomach to the esophagus. The pylorus is the opening between the stomach and the duodenum.
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