The urea cycle is a series of biochemical reactions that occur in the liver. Its primary function is to convert toxic ammonia, produced during protein metabolism, into urea, which is less harmful and can be excreted in urine. This process helps maintain the body's nitrogen balance and prevents the accumulation of ammonia in the bloodstream. The cycle involves several key enzymes and intermediates, including ornithine, citrulline, and aspartate. These components work together to facilitate the conversion of ammonia into urea, which is then transported to the kidneys for elimination. Proper functioning of the urea cycle is essential for overall metabolic health.