Which organ directly filters nitrogenous waste from human blood?
Kidneys
Nitrogenous wastes such as urea are carried in the blood to the kidneys.
In the nephrons of the kidneys, blood is filtered in the glomerulus and the waste leaves the body as urine.
The lungs remove carbon dioxide, the heart pumps blood and the liver makes urea but does not filter it out of the blood.
Hence, the answer is Kidneys.
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