Question
How is urea produced?

Answer

Amino acids are broken down in the liver to form the amino group $(NH_2)$ compounds and keto acids like pyruvic acid and other acids.
​​​​​​​ Urea is formed from the amino group and other ammonium compounds during deamination by combination with $CO_2$​​​​​​​. It takes place by the ornithine cycle.

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