What role does the duodenum play in digestion?

The duodenum plays a crucial role in the initial stages of digestion, acting as the first section of the small intestine immediately following the stomach. Its primary function is to receive partially digested food, known as chyme, from the stomach and mix it with digestive juices from the pancreas, liver, and gallbladder. These digestive juices contain enzymes and bile that are essential for breaking down proteins, carbohydrates, and fats into smaller molecules.

This mixing process in the duodenum facilitates the overall digestion and prepares the nutrients for further absorption as the contents proceed through the remaining sections of the small intestine. Therefore, C correctly identifies the duodenum's role in initial digestion and the mixing of food with these important digestive secretions.