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What exactly do the kidneys do in our body? Why do we need them?

By , About.com Guide

Updated November 27, 2005

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What exactly do the kidneys do in our body? Why do we need them?
Question: What exactly do the kidneys do in our body? Why do we need them?
Learning to understand the function of the kidneys may be easier to understand if you have a visual image of the kidneys.
Answer: The kidneys are an essential part of our urinary system. We have two kidneys, and they are located on either side of the spine in our lower back. They are about the size fo a fist and are bean shaped.

The primary function of the kidney is to filter wastes from our blood. About 50 gallons of blood enter our kidneys every day. They also process approximately two quarts of extra water and waste products.

The wastes that are filtered and extra water turn into urine. The urine then travels down tubes, called ureters and is stored in the bladder until excretion(urination).

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