Assessment Technologies Institute (ATI) Test of Essential Academic Skills (TEAS 7) Science 2025 Practice Test - Free TEAS 7 Science Practice Questions and Study Guide

The primary role of the duodenum in digestion is the digestion of chyme. The duodenum is the first segment of the small intestine and plays a critical role in the digestive process. It receives chyme, which is a semi-liquid mixture of partially digested food and gastric juices from the stomach.

Once the chyme enters the duodenum, it is mixed with bile from the liver and digestive enzymes from the pancreas. This combination is essential for breaking down fats, proteins, and carbohydrates more efficiently. The environment in the duodenum is alkaline due to the bicarbonate from the pancreas, which neutralizes the acidity of the chyme, allowing for optimal enzyme function.

Through this process, the duodenum ensures that nutrients are adequately digested before they move into the rest of the small intestine for absorption. While storage of food and absorption of water are functions associated with different parts of the digestive system, and the production of enzymes occurs primarily in the pancreas and the stomach, the duodenum’s distinct function focuses on the initial stages of digestive chemical processing.