Amino acids absorbed from the alimentary tract and in excess of metabolic requirements, together with those generated by the breakdown of body proteins, are broken down further in a process known as oxidative deamination: The keto acids can be used in other pathways of intermediary metabolism. However, because of its low pH, ammonia is highly toxic to tissues and must be removed rapidly from the body or be rendered harmless. These processes are referred to as excretion.
KeywordsUric Acid Malpighian Tubule Stick Insect Excretory System Rectal Gland
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© P. Calow 1981