Explain how the kidneys produce urine in the simplest terms possible.

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The renal artery carries blood into the kidneys, which once there is filtered by nephrons.  The waste filtered by these nephrons is combined with water to make urine.  As the urine is produced it drains out of a tube called the ureter and collects in the bladder.  Once your bladder...

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The renal artery carries blood into the kidneys, which once there is filtered by nephrons.  The waste filtered by these nephrons is combined with water to make urine.  As the urine is produced it drains out of a tube called the ureter and collects in the bladder.  Once your bladder is about half way fill your body signals you that you have to urinate.  The urine exits your body through a tube called the urethra.

So to summarize:

1. Blood flows through renal artery to kidneys.
2. Waste is filtered out of the blood by nephrons.
3. Water is mixed with the waste collected.
4. The result is urine that is drained through the ureter into the bladder.
5. When your bladder is half full your body thinks "pee!"
6. When you pee it exits out your body through the urethra.

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