... molecules is broken down that the energy is released. This is called a exothermic reaction because it releases energy. In the body there is an enzyme that breaks down the bond that creates this reaction its called ATPase. ATP is broken down into Adenosine diphosphate (ADP) and a single free phosphate ... released by the breakdown of PCr is not used directly. Instead it reforms or rebuilds if you like to maintain a relatively constant supply. The enzyme called creatine Kinase (CK) creates the release of energy from the PCr molecule. This acts upon PCr to separate Pi from creatine . The ....

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