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A short, simple answer is that urine is a by product of bodily waste. Kidneys filter impurities. If the kidneys do not do their job in filtering, there is build up in the renal tubules (an area of the renal system leading to the kidneys) and also in the bloodstream. This causes trouble in the body systemically and, if left untreated, can lead to numerous medical problems. In short, the kidneys are the body's filters. Urine is the after product of our body's waste once the kidney's have filtered it. Urine leaves our bodies as a sterile fluid. Angie RN

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16y ago

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