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The excretion of body wastes and toxic substances are the primary function of the kidneys. The functional excretion unit is the nephron. Each kidney contains about one million nephrons. The nephron has three primary regions that function in the renal excretion process, the glomerulus, proximal tubule, and the distal tubule.
The kidney clearance is a measurement of the renal excretion ability.
The excretion of the radiopharmaceutical used for kidney clearance begins approx. four minutes after application.
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