Ileum: This last section is the longest part of your small intestine. The ileum is where most of the nutrients from your food are absorbed before emptying into the large intestine.Click to see full answer. Consequently, which portion of the small intestine is the longest? ileum Similarly, how long is each part of the small intestine? The length of the small intestine can vary between about 10 feet (3 meters) to over 16 feet (5 meters). For comparison, a standard basketball hoop is 10 feet tall. The different sections of the small intestine are also different lengths. The ileum is the longest section while the duodenum is the shortest. Secondly, why do you suppose that the small intestine is the single longest portion of the digestive tract? The small intestine, despite its name, is the longest part of the gastrointestinal tract. It works with other organs of the digestive system to further digest food after it leaves the stomach and to absorb nutrients.What are the three sections of the small intestine? The small intestine is approximately 2.5–3 cm in diameter, and is divided into three sections: The duodenum is the first section of the small intestine and is the shortest part of the small intestine. The jejunum is the middle section of the small intestine. The ileum is the final section of the small intestine.