Which statement best describes the function of the ileum?

• A. It secretes digestive enzymes to digest fats
• B. It recovers vitamins, solids, and nutrients from the chyme before it passes into the large intestine
• C. It absorbs bile acids
• D. It stores waste before elimination

Answer: (B)

The ileum’s main job is to finish extracting usable material from what arrives from the stomach and the earlier parts of the small intestine, pulling out remaining nutrients and essential compounds before things move into the large intestine. It’s a key site for recovering vitamins and other nutrients, including bile acids that are recycled back to the liver, and vitamin B12. This broad absorptive role is what makes the statement about recovering vitamins, nutrients, and other components from the chyme before it enters the large intestine the best description of its function.

For context, fat digestion actually starts in the small intestine with pancreatic enzymes, and the ileum’s role isn’t to secrete fats-digesting enzymes. It does absorb bile acids, but that’s part of its overall nutrient-recovery function, not the whole story. Storing waste before elimination is a function of the large intestine and rectum, not the ileum.