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The liver transforms ammonia into . This is then filtered from the blood by the kidneys and excreted in . The liver also excretes bile and (a byproduct of haemoglobin catabolism that forms when red blood cells die). Bile travels to the small intestine and is then excreted in faeces by the large intestine.

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The liver transforms ammonia into urea. This is then filtered from the blood by the kidneys and excreted in urine. The liver also excretes bile and bilirubin (a byproduct of haemoglobin catabolism that forms when red blood cells die). Bile travels to the small intestine and is then excreted in faeces by the large intestine.