CKM (Creatine Kinase, Muscle): CKM is an enzyme specific to muscle tissue that plays a key role in energy metabolism. It catalyzes the reversible transfer of phosphate between ATP and creatine to ensure a steady supply of ATP during muscle contraction. Elevated CKM levels in the blood indicate muscle damage and serve as a biomarker for conditions such as myocardial infarction, muscular dystrophy, and other muscle injuries.