ALAIN POL, ISM / SCIENCE PHOTO LIBRARY ALAIN POL, ISM / SCIENCE PHOTO LIBRARY
False-colour X-ray image of the abdominal & pelvic areas of a healthy person, featuring both kidneys (green) & ureters (red - the vessels connecting the kidneys to the bladder, the red circular mass at bottom), outlined using intravenous pyelography (IVP). The technique involves prior intravenous injection of an iodine-based, radio-opaque contrast medium, which is concentrated & excreted by the kidneys. Branches of the renal pelvis (structures of the kidney into which urine is drained), the ureters (25-30 cm long in adults), & the urine-filled bladder are defined. IVP tests kidney function, reveals stones in kidneys or ureters & other malfunctions of the urinary tract.
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