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Normally in the body fluids and minerals in those fluids flow from areas of high concentration to low concentration. However the kidneys are able to remove minerals/toxins from your blood and concentrate them into urine which is much more concentrated. How does it do this?

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Normally in the body fluids and minerals in those fluids flow from areas of high concentration to low concentration. However the kidneys are able to remove minerals/toxins from your blood and concentrate them into urine which is much more concentrated. How does it do this?	721