Liver. False-colour scanning electron micrograph of a section of liver tissue showing a group of red blood cells and a macrophage (yellow) in a capillary. Hepatic macrophages, also known as stellate cells of von Kupffer, are mostly found in the venous blood vessels of the liver and are responsible for the destruction of cellular debris, bacteria and aged red blood cells. Two bile canaliculi (green), or cholangioles, are also visible. Bile is secreted by the liver and stored in the gallbladder: from here it is released into the duodenum where it is needed for fat digestion. Magnification: x1270 at 6x7cm size. x1985 at 4x5ins