Explain how kidneys remove waste from the body and keep fluids and salts in balance

The fluid levels in the body must be balanced and a normal blood pressure must be maintained. An area in the brain, the hypothalamus, constantly watches the amount of water in the blood. When the brain discovers too much water in the blood, the hypothalamus releases a less amount of a specific hormone. This lets the kidneys know to return less water to the blood and to increase the quantity of urine that is excreted.