The bile duct is long tube-like structure that connects the liver to the intestine. The liver makes bile that is required for the digestion of food. The bile from the liver is transported to the intestine by the bile duct.The top half of the bile duct is associated with the liver while the bottom half of the bile duct is associated the pancreas through which it passes on its way to the intestine.It opens in the part of the intestine called the duodenum into a structure called the Ampulla.he liver makes bile that is required for the digestion of food. The bile from the liver is transported to the intestine by the bile duct. The top half of the bile duct is associated with the liver while the bottom half of the bile duct is associated the pancreas through which it passes on its way to the intestine.