What is the shortest portion of the small intestine?

The duodenum is indeed the shortest portion of the small intestine, measuring about 25 to 30 centimeters (10 to 12 inches) in length. It serves a critical role as the first section of the small intestine, primarily responsible for the initial phase of digestion. This segment receives chyme from the stomach, along with bile from the liver and pancreatic juices, allowing for the emulsification of fats and neutralization of stomach acids, which is essential for proper nutrient absorption.

Understanding the length and function of the small intestine's sections helps clarify why the duodenum is specifically the shortest. In contrast, the jejunum and ileum are longer, with the jejunum typically measuring around 2.5 meters (8 feet) and the ileum approximately 3 meters (10 feet) in length. The appendix, although associated with the digestive system, is not part of the small intestine and thus does not contribute to this assessment.