According to McCuskey (2012), one of the largest abdominal organs and the most complex in the body is the liver as it has many essential metabolic functions. The nutrients are converted into substances stored in the body to be supplied for cells when needed. Moreover, the toxic substances are converted into harmless substances to be released from the body. Scheuerlein and Köckerling (2000) stated that the human adult liver weighs about 1.4 kg (3.1 pounds) and located in the right upper abdomen, below the diaphragm. The principal cell type in the liver is hepatocytes and biliary epithelial cells both are derived from the embryonic endoderm. It takes up most of the space under the ribs and some space in the left upper abdomen, too. It is distinguished from outside as the larger right lobe and smaller left lobe. The two lobes are separated by a band of connective tissue that anchors the liver to the abdominal cavity. The gallbladder, wherein bile is stored, is located in a small hollow on the underside of the liver (Ellis, 2011).


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