Word: nephrons
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Each kidney contains a million filtration units called nephrons. Each nephron is made up of a tuft of microscopic blood vessels, called a glomerulus, and each of these has a minute tubule at tached (see diagram, right). When blood flows into the glomeruli and around the tubules, one-fifth of its water content is led aside for finer filtration. One hundredth part of this is extracted and passes eventually to the bladder...
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