Caption

Abdomen with liver. Coloured computed tomography (CT) scan of an axial section through a human abdomen showing a healthy liver. In this scan the abdomen is seen from below. At upper centre a vertebra of the spine joins onto the rib cage (both white and blue). The liver (pink) is the largest organ in the body and regulates the levels of most of the main chemicals in the blood. Red hepatic arteries run across the surface of the liver. To the left of the vertebra is the gall bladder (green). A CT scan is made by X-ray beams to produce "slice" images through the body. In this scan unwanted tissue has been removed using a computer.