Excretion of the molecule known as Urea (contains Nitrogen = toxic to body and cannot be stored)
The original form of nitrogen = Amino Acids (excess). Amino Acids that are in excress must be removed; this is role of the liver and the kidney.
Blood circulates to the Liver and Amino acids are broken down and converted into the molecule Urea.
This reenters the blood steam and enters both kidneys. The Kidneys will filter the Urea from the blood and the urea will be added to water to create Urine. The Urine travels down the ‘Ureter’ in the Kidneys to collect in the bladder.
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