<prompt> Myocardial infarction is associated with increased ofCPKCPK-MMCPK-MBCPK - BB  <response>: C. i.e. CPK - MB III - U. Satyanarayan 3rd 599- Rana Shinde 7thCPK exists as three isoenzyme - Each isoenzyme is a dimmer composed of two subunits - M muscle or B brain or bothIso enzymeSubunitTissue of originCPK,BBBraincpk2MBHeartCPK3MMSkeletal muscle CPK2- MB is the earliest reliable indication of myocardial infarction Troponins are more sensitive and specific CPK - NOT found in RB cells and it level is not affected by haemolysis Normal value - 4 - 60 IUL at 37degC 