Nikolas
Created page with "== Learning objectives == * Why must ammonium be excreted? * How is ammonium excreted in humans? * What are the sources of ammonium? * Describe the urea cycle * Which is the rate-limiting step of the urea cycle? * How is the urea cycle regulated? * What is the aspartate-argininosuccinate shunt? == Excretion of ammonium == Ammonium is toxic, especially to the brain, and so it should be excreted. In humans ammonium is excreted in the form of urea. Urea is water-soluble a..."