Digestion usually involves splitting of bonds between molecules, or between parts of molecules.
Nutrients are absorbed by epithelial cells and passed into capillaries. Most absorption of nutrients occurs in the small intestine . The small intestine enters the large intestine a couple inches up from the end, rather than at the end of the large intestine. This results in the formation of a small pouch on the end of the large intestine called the cecum . Rectum - last portion of the large intestine.