- the excretion of the molecule urea (contains nitrogen, toxic to the body and cannot be stored)
- the original form of nitrogen circulation in our blood stream and potentially toxic are the amino acid, used for growth but extra amino acids must be remove
- role of the liver and kidney
- first stage blood circulate to the liver where amino acid are broken down and converted into the molecule (urea)
- re-enter the blood stream and to be removed from the body, circulates to the kidney
-kidney will filter the urea from the blood
- urea + water= urine
-collected in the bladder = in form of urine
- the filtered blood returns to the circulation in the veins with amino acid (toxic) and urea is removed
= example of excretion
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