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Sources of ATP for muscle contraction

Skeletal muscle uses only ATP as a source of energy for contraction. However, intracellular stores of ATP are quite limited. In fact, the amount of ATP normally found in skeletal muscle is enough to sustain only a few seconds of contraction. Therefore, metabolic pathways to form additional ATP are needed. These pathways include  [Pg.146]

Energy may be transferred from creatine phosphate to ADP by way of the following reaction  [Pg.146]

The enzyme creatine kinase (CK) facilitates the transfer of phosphate and energy to a molecule of ADP to form ATP. Stores of creatine phosphate are sufficient to sustain approximately 15 more seconds of muscle contraction. Because this is a single-step process, it provides ATP very rapidly and is the first pathway for formation of ATP to be accessed. [Pg.146]


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