The Digestive System
The gastrointestinal or digestive tract (also known at the GI tract or gut) is the system of organs which remove and process nutrients (vitamins, minerals, carbohydrates, fats, proteins and water) from foods and helps pass waste material out of the body.
The gastrointestinal tract is made up of the oesophagus, stomach and the small and large intestines.
The oesophagus is the hollow muscular tube that moves food and liquid from the throat to the stomach. The wall of the oesophagus is made up of several layers of tissue, including mucous membrane, muscle and connective tissue.