The two kidneys in the human body are very vital organs required for our body to function properly. The kidneys filter out all the unwanted substances from the blood and pass it out as urine and keep the right number of electrolytes. The blood is filtered about forty times a day by the kidneys. When the blood is run through the kidneys, they filter out the waste and adjust the salt, minerals, water and essential vitamins as per the body’s requirement. The filtered blood circulates in the body collecting more impurities and waste produced by the body and carrying it to the kidneys, repeating the cycle.