What is the third part of the small intestine known as?

The third part of the small intestine is known as the ileum. This section plays a crucial role in the digestive process, as it is responsible for the absorption of nutrients, such as vitamins and minerals, and the remaining digested food. The ileum connects to the large intestine at the ileocecal valve, which controls the flow of material from the small intestine to the large intestine and prevents backflow.

Understanding the breakdown of the small intestine can clarify why the ileum is the correct answer. The first part is the duodenum, which primarily focuses on the initial phase of digestion, breaking down food through enzymes and bile. The second part is the jejunum, which is mainly involved in the absorption of nutrients. In contrast, the ileum's role is significant as it completes the absorption process before the remnants proceed to the large intestine.

This distinction helps in understanding the individual functions of each section of the small intestine and highlights why the ileum is designated as the third part.