Proteins in muscle cells regulate the speed of chemical reactions. By analyzing the levels of these muscle enzymes in the blood, doctors can identify specific disorders. For instance, during a heart attack or myocardial infarction, the damaged heart muscle releases enzymes into the blood at elevated levels. Similarly, in conditions like muscular dystrophy, increased muscle enzyme levels indicate muscle cell death. Notably, enzymes originating from the heart muscle are different from those from skeletal muscles, allowing doctors to pinpoint the location of muscle damage.