Ingestion is the taking substances (e.g. food, drink) into the body through the mouth.
Digestion is the breakdown of large, insoluble food molecules into small, watersoluble molecules using mechanical and chemical processes.
Absorption is the movement of small food molecules and ions through the wall of the intestine into the blood.
Egestion is the passing out of food that has not been digested, as faeces, through the anus.
