K H FUNG / SCIENCE PHOTO LIBRARY K H FUNG / SCIENCE PHOTO LIBRARY
Liver and spleen and kidneys, 3D coloured computed tomography (CT) scan. The liver (upper right) is the largest gland in the human body. It plays a vital role in metabolism, storing nutrients in forms such as glycogen, and helping to clean the blood of toxins and other waste products. The spleen (upper left) is part of the lymphatic system. It is involved in processing white blood cells (lymphocytes), and it also regulates the number of red blood cells in the bloodstream by destroying old cells. The kidneys (centre left and centre right, either side of the spine, green) filter waste products from the blood, passing them in the form of urine to the bladder.
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