A Report On The Phosphocreatine System

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The phosphocreatine system is fueled by a molecule called adenosine triphosphate, or ATP, which is broken down by the body. When broken down, ATP releases energy and a by product adenosine diphosphate, or ADP. Unfortunately, the body only has a limited amount of ATP and has to be replenished in order for it to properly function. The energy system that will be discussed in this paper is the phosphocreatine system, which is used in high power, short duration activities. In the phosphocreatine system, ATP is produced when there is a high demand for energy, as said previously, in activities such as the 100 meter sprint. This process occurs between two molecules of ADP and phosphocreatine (PCr). PCr donates its phosphate group to ADP to form ATP allowing for quick energy. This is called the creatine phosphate shuttle and only lasts approximately 6-8 seconds. After PCr donates its phosphate group, the molecule coverts into creatine and is later able to replenish its phosphate group. This process is said to be in equilibrium, since the phosphate group can be transferred back and forth between ATP and PCr. The reason for a short period of sustainability is because PCr is stored in the cells of muscles in small amounts, varying in genetics. When the body is at rest and there is an abundance of ATP, the body will replenish the phosphate group in the crea-tine molecule forming PCr once again for later use. The breakdown of phosphocreatine can help to maximize muscle contraction by
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