Certified Neuroscience Registered Nurse (CNRN) Practice Exam

What is the role of the ileocecal valve?

1. Prevents reflux from the cecum to the ileum

2. Facilitates peristalsis

3. Secretes digestive enzymes

4. Absorbs water from waste

The correct answer is: Prevents reflux from the cecum to the ileum

The ileocecal valve plays a crucial role in the digestive system by acting as a barrier that prevents the backflow of contents from the cecum (the beginning of the large intestine) into the ileum (the last part of the small intestine). This function is essential because it helps maintain the direction of digestion, ensuring that digested food progresses through the intestines in a one-way flow. By preventing reflux, the ileocecal valve helps to promote effective digestion and nutrient absorption while protecting the small intestine from bacteria that reside in the larger intestine. In terms of the other options, they do not accurately reflect the primary function of the ileocecal valve. The valve does not facilitate peristalsis, secrete digestive enzymes, or absorb water; those functions are associated with different parts of the digestive system. Peristalsis is primarily driven by the muscular contractions in the intestines, digestive enzymes are secreted by the pancreas and the lining of the intestine, and water absorption occurs mainly in the colon. Therefore, the correct answer highlights the valve's specific protective and functional role in digestion.