BSIP, CAVALLINI JAMES / SCIENCE PHOTO LIBRARY BSIP, CAVALLINI JAMES / SCIENCE PHOTO LIBRARY
Kidney. Coloured angiogram (X-ray) of a kidney with a bifid ureter (yellow). This is an abnormality in which the ureter divides into two at the kidney. Blood arrives at the kidney from the aorta (purple, down right) through the renal artery (purple), which branches many times inside the kidney. Waste products from the blood are then passed to the bladder (not seen) through the ureter, which has a single tube in most people. Angiography involves injecting a contrast medium opaque to X-rays into the blood vessels, which highlights them when an X-ray of the area is taken.
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