- urea (nitrogen) come from amino acids, urea is toxic to us in excess - the role of the kidney is to get rid of it
- blood circulates to the liver, its then broken down into the molecule urea
- it re-enters into the blood stream and goes into the kidneys, these will then filter the urea form the blood
- water then goes into the urea to form urine, this drains down the ureters and goes into the bladder
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