There are three parts to the small intestines: the duodenum, the jejunum, and the ileum. The duodenum is the first section and is the shortest and the widest part of the small intestines. The small intestine is just over 9 meters long.
The large intestine absorbs fluids from the solid mass received from the small intestine and stores the leftover, unused part of the food. After most of the fluid has been absorbed from the mass, it enters the rectum and then exits the body through the anus.
