What happens to nutrient macromolecules in an animal's digestive tract?

Answer 1

The carbohydrates are absorbed by the intestinal villi and transported to the liver where they are stored as glycogen for emergency use. The amino acids and glucose end up being sent to the cells to create protein and ATP. The Lipids are taken to the lymphatic system via the lacteals and eventually end up in the blood when the lymph is dumped into the circulatory system. They will make their way to the cells to help form cellular membranes along with the protein.

Answer 2

The macromolecules get broken down into their smaller subunit molecules which the body can use to build its own kind of molecules.