Urea cycle

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In biology, the urea cycle (also called the ornithine cycle) breaks down amino acids.^[1]

The urea cycle produces:

• fumarate which enters the citric acid cycle to produce energy.
• ornithine which re-enters the urea cycle.
• urea which is toxic and is excreted.

References

1. ↑ Stryer, Lubert; Berg, Jeremy Mark; Tymoczko, John L. (2002). “23.4. Ammonium Ion Is Converted Into Urea in Most Terrestrial Vertebrates”, Biochemistry. San Francisco: W.H. Freeman. ISBN 0-7167-3051-0.