The ileum aids in the subsequent digestion of food passed through the stomach and other sections of the small intestine. It ingests nutrients and water from meals, preparing them for utilization by the body.

The appendix has an unknown purpose. According to one theory, the appendix works as a reservoir for good bacteria, “rebooting” the digestive system following diarrheal illnesses.

The large intestine has three primary functions: water and electrolyte absorption, vitamin production and absorption, and feces formation and propulsion toward the rectum for excretion.

Reference:
Wilk-Blaszczak, M. (n.d.). Digestive system. Histology. Retrieved from https://uta.pressbooks.pub/histology/chapter/digestive-system/