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Secretin, the digestive hormone that stimulate pancreatic secretion, also increases bile secretion. Its main effect, however, is to increase the secretion of water and sodium bicarbonate from the lining of the bile duct.
The secretion of bile can be considered to occur in two stages: 1  Initially, hepatocytes secrete bile into canaliculi, from which it flows into bile ducts. This hepatic bile contains large quantities of bile acids, cholesterol and other organic molecules. As bile flows through the bile ducts it is modified by addition of a watery, bicarbonate-rich secretion from ductal epithelial cells.