K H FUNG / SCIENCE PHOTO LIBRARY K H FUNG / SCIENCE PHOTO LIBRARY
Kidney. Coloured 3D computed tomography (CT) scan of a normal human kidney, including areas such as the cortex (outer layer), medulla (next layer in), the calyces (branching out from centre), the renal pelvis (centre), ureter (lower left), and vascular pedicle (or renal hilum, just left of centre). The kidneys (of which there are two) perform a vital role in cleaning the blood. They filter waste products such as urea (a nitrogenous waste) and excrete the urea in the form of urine.
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