Creatine phosphokinase (CPK) is an enzyme in the body. It is found mainly in the heart, brain, and skeletal muscle. The main task for CPK is to convert creatine into phosphate. When muscle damage or stress occurs the levels of CPK increase, because muscle injury causes the muscle cells to open. As large amounts of CPK is present in the muscle cells, their splitting open results in spilling of CPK into the blood, and hence raising the levels of CPK present in the blood.
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