The blood vessels that bring blood to the kidneys for filtering are called the .
The collection of capillaries where plasma leaks out to begin the filtration process form a .
The inner part of a kidney where salt and water balance are maintained is called the .
The blood vessels that take filtered blood away from the kidney back to the circulatory system are called the .
The structural and functional unit of the kidney, of which there are about 1 million in each kidney, is called the .
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