Name the part(s) of the digestive system in which the products of digestion are absorbed into the blood.

• A. Stomach
• B. Esophagus
• C. Ileum
• D. Large intestine

Answer: (C)

Absorption of digested nutrients into the bloodstream happens where the lining of the intestine is specialized to transfer substances into blood vessels. The ileum, the final section of the small intestine, is a key site for this transfer, particularly for nutrients like vitamin B12 and reabsorbed bile acids, as well as for many other digested products that have passed through earlier sections. The stomach is more about breaking down food with acids and enzymes and absorbs only small amounts; the esophagus mainly serves as a passageway; and the large intestine focuses on absorbing water and electrolytes, with limited nutrient absorption. So, the ileum is the most appropriate site among the options for absorbing digestion products into the blood.