Function. The primary function of the kidneys is to filter the blood and remove excess fluid from it. The kidneys leave just the right amount of salt and other minerals in the blood. The excess amount is filtered from the blood in the form of a waste liquid called urine.
The kidneys are two bean-shaped organs in the renal system. They help the body pass waste as urine. They also help filter blood before sending it back to the heart. The kidneys perform many crucial functions, including: maintaining overall fluid balance.
Urine Formation – Another Vital Function of the Kidney Once the kidneys have filtered the blood and removed the waste products from it, the next step is to get rid of the wastes from the body. Urine formation is the process by which the kidneys prepare waste products, filtered from the blood, for elimination from the body.