Which section of the digestive tube consists of the duodenum, jejunum, and ileum?

The section of the digestive tube that consists of the duodenum, jejunum, and ileum is the small intestine. This part of the digestive system is responsible for the majority of nutrient absorption.

The small intestine is divided into three distinct sections: the duodenum, which is the first part and is primarily involved in the chemical digestion of food with the aid of enzymes and bile; the jejunum, which is the middle section where a significant amount of nutrient absorption occurs; and the ileum, which is the final part that continues the process of digestion and absorption, specifically focusing on vitamins, bile salts, and any remaining nutrients.

In contrast, the large intestine primarily functions in the absorption of water and the formation of feces, and is not made up of the sections mentioned in the question. The esophagus is simply a muscular tube that carries food from the throat to the stomach, and the stomach is responsible for food storage and initial digestion through acid and enzymes but does not include any of the components of the small intestine.