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The human liver is composed of three parts: the right lobe (the largest), the left lobe, and two small lobes that are located behind the right lobe. Each lobe is composed of small, multisided units called lobules. Most livers have between 50,000 and 100,000 lobules. The essential work in each lobule is performed by a bundle of liver cells that surround the central vein found in each lobule. These bundles, often called sheets, are separated by cavities known as sinusoids. It is the presence of these sinusoids that accounts for the liver‟s somewhat spongy texture and its ability to absorb large amounts of blood.