<prompt> Which of the following condition shows an increase in serum level of Creatinine Kinase 1 CK 1?Myocardial ischemiaBrain ischemiaKidney damageElectrical cardioversion  <response>: CK-1 or CK-BB is found primarily in brain tissue. Hence it is increased in brain ischemia. Ref: Clinical Biochemistry By Jiro J. Kaneko, John W. Harvey, Michael Bruss, 1997, Page 317 