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 h English (en)The chemical reactions of metabolism are organized into [[metabolic pathway]]s, in which one chemical is transformed through a series of steps into another chemical, each step being facilitated by a specific [[enzyme]]. Enzymes are crucial to metabolism because they allow organisms to drive desirable reactions that require [[energy]] and will not occur by themselves, by [[Coupling (physics)|coupling]] them to [[spontaneous process|spontaneous reactions]] that release energy. Enzymes act as [[Catalysis|catalysts]] – they allow a reaction to proceed more rapidly – and they also allow the [[Metabolic pathway#Regulation|regulation]] of the rate of a metabolic reaction, for example in response to changes in the [[cell (biology)|cell's]] environment or to [[cell signaling|signals]] from other cells.
 h Japanese (ja)代謝の化学反応は[[metabolic pathway/ja|代謝経路]]に組織化されており、そこではある化学物質が一連のステップを経て別の化学物質に変換され、各ステップは特定の[[enzyme/ja|酵素]]によって促進される。酵素は、エネルギーを放出する[[spontaneous process/ja|自発的反応]]に[[Coupling (physics)/ja|結合]]させることによって、[[energy/ja|エネルギー]]を必要とし、それ自体では起こらないような望ましい反応を生物が推進することを可能にするので、代謝にとって極めて重要である。酵素は[[catalysis/ja|触媒]]として機能し、反応をより速く進行させる。また、例えば[[cell (biology)/ja|セルの]]環境の変化や他の細胞からの[[cell signaling/ja|シグナル]]に応答して、代謝反応の速度を[[Metabolic pathway/ja#Regulation|調節]]することもできる。