Digestion is the process by which ingested food is broken down in the gastrointestinal tract into a form that can be absorbed into the tissues of the body.
This includes mechanical processes (such as chewing and grinding the food) as well as chemical processes (that is, using the digestive enzymes and other substances like bile and gastric acid).
The majority of the chemical digestion takes place in the stomach and small intestine and then the resulting smaller molecules are absorbed in the small intestine.
Detoxification is one of the functions of the liver and is the process where toxic substances are removed or neutralised.
Peristalsis is induced by distension of the intestinal wall and describes a wave-like motion that progressively moves food along the gastrointestinal tract.
Ultrafiltration is the high pressure system of the glomerulus that moves water and solutes into the Bowman's capsule in the kidney contributing to the formation of urine.