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How does your body filter blood?
The liver plays an important role in the excretory. The liver breaks down toxins in the blood. A toxin is a poisonous substance. The toxins are later filtered out of the blood by the kidneys. Blood enters the kidneys through the renal artery and flows into smaller capillaries. The capillaries then carry the blood to tiny filters call nephrons. A nephron is the structure in the kidneys that separates waste from the useful materials in the blood.