2.68a Excretion

Understand how the kidney carries out its roles of excretion and of osmoregulation 

1. Excretion of Urea -> nitrogen (toxic) excess amino acids

- Blood circulates to the liver and the amino acids are broken down into the molecules --> Urea.
-Urea then circulates to the kidneys
- The kidneys filter the Urea from the blood 
- Urea is added to water --> Urine
- Urine is then collected in the bladder
-Urea is now in the bladder and removed from the body