Which is NOT a section of the small intestine?

Which is NOT a section of the small intestine?

• A. Colon
• B. Duodenum
• C. Jejunum
• D. Ileum

Answer: (A)

The small intestine is made up of three sections: the duodenum, where chyme mixes with bile and pancreatic juices; the jejunum, the primary site of nutrient absorption; and the ileum, which continues absorption and reabsorbs bile acids and vitamin B12. The colon belongs to the large intestine, whose main roles are absorbing water and electrolytes and forming stool. Since the colon is not part of the small intestine, it is the correct choice for “not a section of the small intestine.”

The small intestine is made up of three sections: the duodenum, where chyme mixes with bile and pancreatic juices; the jejunum, the primary site of nutrient absorption; and the ileum, which continues absorption and reabsorbs bile acids and vitamin B12. The colon belongs to the large intestine, whose main roles are absorbing water and electrolytes and forming stool. Since the colon is not part of the small intestine, it is the correct choice for “not a section of the small intestine.”