GJLP / SCIENCE PHOTO LIBRARY GJLP / SCIENCE PHOTO LIBRARY
Kidneys. Coloured 3-D computed tomography (CT) scan of normal human kidneys (red) and surrounding structures. On top of the kidneys are the adrenal glands (pink), where certain hormones are made. The yellow structures are bones - the ribs at the top right and left, the spine in the middle. The green and blue vessels are veins and arteries res- pectively. The vertical blood vessels are the vena cava (green) and the aorta (blue). Branching to each side of these are the renal arteries and renal veins. The kidneys are situated at the back of the abdominal cavity just above the waist. They filter waste products and excess water out of the blood.
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