Abstract
1. Hepatic ducts are so extensive that they can reserve the bile in them. The bile flow in the tracts is regulated by the compression of liver following the respiratory movement of diaphragm.
2. The intraluminal pressure difference between the distal end and proximal end of the common bile duct plays an important role in the flow of bile in the extrahepatic bile duct.
3. When the intraluminal pressure of the ampulla becomes more than 4 cm H2O by the contraction of the ampulla, the inner orifice opens and the bile in the ampulla is forced to expel into the duodenum following the contraction of duodenum. The sphincter mechanism played by the inner orifice might exsist (Fig. 3.B.i) . This orifice is surrounded by the circular muscles which are ramified from the same layer of the duodenum.
4. When the inner pressure rises to 100-150 mm H2O, the gall bladder becomes active and expells gall into the common bile duct. The bottom portion of the bladder always repeats the weak contractions mixes the gall.
