Do you know which body organs keep you alive? Yes, you must
have your heart, lungs, and brain, but do you know the other one? You also must have
working kidneys.
Kidneys are the main organs of the excretory system. Kidneys
come in pairs, but you need only one to live.
The
main job of the kidneys is to filter waste out of the
blood. All cells make waste as they use the food,
water, and oxygen. This waste passes back into our
blood. This blood then travels to the kidneys where the
waste and extra water are filtered out. Clean blood then
leaves the kidneys, traveling back to the heart to be pumped through
the body again. About 50 gallons of blood are filtered
through the kidneys each day. Combining
the waste from our cells (urea) with extra body water, our kidneys
make urine. Thanks to our kidneys, our blood stays clean and our bodies stay
alive and healthy.
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