Which three regions make up the small intestine?

The small intestine is divided into three distinct regions: the duodenum, jejunum, and ileum. Each of these sections plays a critical role in digestion and nutrient absorption.

The duodenum is the first segment, where a significant portion of digestion occurs as it receives bile from the liver and digestive juices from the pancreas. Following this, the jejunum is the middle section, mainly involved in the absorption of carbohydrates and proteins. Finally, the ileum, the last part of the small intestine, is responsible for the absorption of vitamins, bile salts, and any remaining nutrients.

This organization reflects the specialized functions of each section, emphasizing their roles in processing food as it passes through the digestive system. Understanding the structure of the small intestine and these specific regions is crucial for recognizing how digestive health and nutrient absorption occur in the body.