[header] How to study the functions of the liver in humans [title] Learn about the structure of the liver. [step] Its structure is unusual in the sense that it has dual blood supply from two different sources. One of them is through the hepatic artery that supplies blood that is rich in oxygen to the liver tissue. 
The other blood source is from the portal vein which originates in the digestive system in its various parts. [title] Study the role of the blood supply to the liver.