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Gall bladder. Historical illustration of a gall bladder (centre, blue). This organ receives and stores bile from the liver through the bile duct (lower centre and centre left) which drains the biliary ducts of the liver (seen in liver tissue at upper and lower left). The bile is released into the digestive tract to aid in fat digestion. The internal surface (centre right) of the gall bladder is shown with the columnar cells of this surface (lower right). The veins draining blood from three lobules of the liver are at upper right. The liver regulates blood chemistry. Colour lithograph by Fairland from The Viscera of the Human Body, 1840. Based on drawings by Bagg. (KEYSTONE/SCIENCE PHOTO LIBRARY/SHEILA TERRY)