The duodenum, jejunum, and ileum are all parts of which organ?

The duodenum, jejunum, and ileum are all sections of the small intestine. This organ is crucial in the digestive process, as it is responsible for the majority of nutrient absorption after food is broken down in the stomach. Each part of the small intestine plays a specific role: the duodenum is the first section where initial digestion occurs, mixing chyme with bile and pancreatic juices; the jejunum is primarily involved in the absorption of carbohydrates and proteins; and the ileum absorbs vitamins and bile salts.

Understanding the anatomy and function of the small intestine is vital in medical coding as it helps coders accurately associate diagnoses and procedures with the correct anatomical sites for reimbursement and record-keeping purposes. The other options do not pertain to the small intestine, as the large intestine is responsible for water absorption and feces formation, while the liver and gallbladder specialize in processing and storing bile, respectively.