understand how the kidney carries out its role of excretion and of osmoregulation
-excretion of the molecule urea (carries nitrogen and it is toxic to the body and cannot be stored)
-the original form of nitrogen circulating in our blood stream and is potential toxic are the amino acids.
-amino acids are normally used for growth but extra amino acids must be removed- they are toxic, rule of both liver and kidney.
-first stage- blood circulates to the liver and the amino acids are broken down and converted into the molecule urea.
-the urea re-enters the bloodstream and circulates to both kidneys.
-the kidneys will filter the urea from the blood and the urea will be added to the water to form urine.
-urine drains down the ureter to collect in the bladder.
-the urea is now in the bladder in the form of urine- been removed from the body.
-the filtered blood returns to the circulation in the veins with the toxic amino acids and urea removed- example of excretion.
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