<prompt> Which of the following is the order of activation after stimulation of Purkinji fibrs is :Septum - Endocardium - EpicardiumEndocrdium - Septum - EpicardiumEpicardium - Septum - EndocardiumSeptum - Epicardium - Endocardium  <response>: Ans. is a is Septum - Endocardium - Epicardium Order of spread of cardiac excitationSA node - AV node - Bundle of HIS - Purkinje system - Ventricular muscle.SA node - AV node - Bundle of HIS - Purkinje system - Ventricular muscle.Order of activation of ventricular muscle.Depolarization starts of the left side of the interventricular septum - Moves first to the right across the mid portion of the septum - Activation of anteroseptal region of the ventricular myocardium Apex.- Activation of the major portion of ventricular myocardium from the endocardium to the epicardium.Last parts of the heart to be depolarized ar? the postero basal portion of the left ventricle The pulmonary conus Upper most portion of the septum 