Duodenum

Definition

The duodenum is the first section of the small intestine immediately following the stomach. It plays a crucial role in digestion by receiving chyme from the stomach and mixing it with digestive enzymes and bile.

5 Must Know Facts For Your Next Test

1. The duodenum receives partially digested food (chyme) from the stomach.
2. It is responsible for the majority of chemical digestion in the small intestine.
3. The pancreas secretes enzymes into the duodenum to aid in breaking down proteins, fats, and carbohydrates.
4. Bile from the liver and gallbladder enters the duodenum to help emulsify fats.
5. The pH of chyme is neutralized in the duodenum, creating an optimal environment for enzyme activity.

Review Questions

• What role does the duodenum play in digestion?
• Which organs secrete substances into the duodenum, and what are they?
• How does the duodenum contribute to fat digestion?

Related terms

Chyme: Partially digested food mixed with digestive juices that moves from the stomach to the small intestine.

Pancreatic Enzymes: Digestive enzymes secreted by the pancreas into the duodenum to aid in breaking down nutrients.

Bile: A digestive fluid produced by the liver and stored in the gallbladder that helps emulsify fats for digestion.