Ammonia is a sharp-smelling, colorless gas. In metabolism, ammonia is present as ammonium and plays a crucial role in the breakdown and synthesis of amino acids. Humans produce the non-essential amino acids in this way.

Under normal circumstances, the body constantly detoxifies itself from ammonia, primarily through the liver. In liver failure, however, toxic concentrations of ammonia occur, which can affect the brain and also lead to death.

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