The GI tract functions to provide the body with water, electrolytes, and nutrients.
Food is moved through the system while digestive enzymes that break down the food are secreted.
The esophagus moves food from the pharynx to the stomach by successive, synchronized contractions. The food is stored here while hydrochloric acid is secreted and mixed with the food, beginning the digestive process. It is at the beginning of the duodenum that secretions from the pancreas and liver enter via the common bile duct. The liver produces bile that is stored in the gall bladder and released as needed for digestion. The pancreas is located below the stomach and secrets important digestive enzymes.