Creatine kinase CK is also known as creatine phosphokinase CPK and is an enzyme that catalyzes the phosphorylation of creatine. Disruption of cell membranes due to hypoxia or other injury releases CK from the cellular cytosol into the systemic circulation. Cardiac Markers Myocardial Infraction F R E K Pathology Nclex Cardiac Creatine Kinase CK or CPK in serum NHANES 2011-2012 2. . In the cytosol CK is composed of two polypeptide subunits of around 42 kDa and two types of subunit are found. Protein can serve as an energy substrate if. Avoid exercise when it. Creatine kinase is a dimer that exists as isoenzymes with greatest activity in muscle CK-MM heart CK-MB and brain CK-BB Lang 1981. CK stands for creatine kinase an enzyme that leaks out of damaged muscle. Creatine kinase CK a dimeric protein is an enzyme that catalyzes the transfer of high-energy phosphate from ATP to creatine and thus is important in maintaining cellul...