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The function of the kidneys is to keep the blood chemically balanced and devoid of toxins and to expel urine through the ureters and into the urinary bladder. The kidneys process about 200 gallons of blood each day, sending the waste products and excess water to the bladder. In addition, the kidneys secrete three hormones. Erythropoeitin stimulates the production of red blood cells, renin helps regulate blood pressure, and the active form of vitamin D (calcitriol) serves to increase the levels of calcium and phosphorus in the bloodstream.
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