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The duodenum is a short portion of the small intestine connecting it to the stomach. It is about 10 inches (25 cm) long, while the entire small intestine measures about 20 feet (6.5 meters).
What are the Functions of the Duodenum. The small intestine consists of three segments: duodenum, jejunum and ileum. Every segment of the small intestine performs different digesting functions. The duodenum is involved in breaking down the food and absorption of nutrients. Duodenum Overview