Answer:
The kidneys filter "metabolic wastes" from blood and forms urine.
Explanation:
The kidneys filter "metabolic wastes" out of the blood and forms urine. The main function of kidneys is to excrete the nitrogenous waste from the blood and to form urine. Major nitrogenous wastes as produced in human body are urea, ammonium, creatinine, and uric acid. Amino acid metabolism forms urea while breakdown of amino acids in liver forms ammonia. Both ammonia and urea are toxic and should be released from the body which is done by kidneys.
