So the liver cells are responsible for reading the body of a wide range of toxic of poisonous substance. For example, drugs that we ingest into our body, alcohol that we ingest, different types of metabolic end products such as, for example, lactic acid, as well as ammonia that we just described above. So remember, when we break down amino acids into ATP molecules we produce ammonia, a toxic substance. And what the liver does, it transforms that ammonia into urea, which is a nontoxic substance that can be excreted by our kidneys. Now, the liver also detoxifies pollutants, various types of contaminants and many, many other things. So the liver converts these toxins, which are usually fat soluble, into water soluble waste products that can easily be excreted in either our bile, which eventually ends up in our feces and is excreted by the large intestine.