Final answer:
Proteins are broken down into amino acids, and during this breakdown, nitrogenous compounds are produced. One of the nitrogenous compounds is urea, which is the primary nitrogenous compound found in human urinary waste.
Step-by-step explanation:
During the breakdown of proteins, nitrogenous compounds are produced. Proteins are broken down into amino acids, which undergo deamination, resulting in the removal of their nitrogen groups. This deamination process converts amino groups into toxic ammonia. However, in the liver, most of the ammonia is quickly converted into urea, which is less toxic. Urea is the primary nitrogenous compound found in human urinary waste.