Define Regulation of Water Balance - For the Digestive Process?

For the digestive process alone, the estimated daily volume of fluid that enters and leaves the gastrointestinal (GI) tract is estimated to be about 9 litres (consisting of saliva, gastric juice, bile, pancreatic and intestinal juice and water intake). The fluid exchange between the GI tract and the blood circulation are variable from hour to hour; yet they are so balanced that the volume of blood and the fluids within the tract are in equilibrium. The daily losses from the bowel rue only around 100-200 ml. Almost all of the fluid is reabsorbed from the gut.