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The question implies that the urine is already formed prior to arrival at the kidneys. This assumption is inaccurate. Unrine is formed in the kidneys, by the kidneys, when blood is filtered to make a solution of urea, ions, glucose and water. The glucose, along with some of the water and ions, are reabsorbed into the bloodstream, leaving a solution of urea and excess water/ions. This is the urine that we excrete when we pay a visit to the loo.

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14y ago
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Q: How does urine get to the kidney?
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