Which three parts make up the small intestine?

The small intestine is made up of three distinct parts: the duodenum, jejunum, and ileum. Each of these sections has unique functions in the digestive process.

The duodenum is the first segment, where a significant amount of digestion occurs. It receives bile from the liver and pancreatic juices, which help in the breakdown of food.

Following the duodenum, the jejunum is the middle section of the small intestine, playing a crucial role in the absorption of nutrients. Its lining has numerous folds and villi that increase the surface area for absorption.

Lastly, the ileum is the final part of the small intestine. It continues the absorption process and is responsible for absorbing vitamin B12 and bile acids, which are recycled back to the liver.

Understanding the roles and sequences of these three sections helps clarify their importance in the overall process of digestion and nutrient absorption in the body.