<prompt> Which one of the following molecules serve as the earliest marker in myocardial infarctionMyoglobinTroponinHbA2CK MB  <response>: Myoglobin is found in cardiac and skeletal muscle. It is released more rapidly from infarcted myocardium than troponin and CK-MB and may be detected as early as two hours after an acute myocardial infarction. Ref: Biochemistry by U. Satyanarayana 3rd edition Pgno : 107-112 