What metabolic breakdown results in ammonia and urea as waste products?

The metabolic breakdown of proteins results in ammonia and urea as waste products. When proteins are degraded, amino acids are removed through deamination, producing ammonia as a toxic byproduct. To safely eliminate ammonia, the liver converts it into urea through the urea cycle, which is then excreted by the kidneys in urine. This process is essential for maintaining nitrogen balance in the body.