<prompt> Depolarization of human ventricular muscle starts fromPosterobasal part of ventricleLeft side of interventricular septumUppermost portion of interventricular septumBasal portion of ventricle  <response>: Order of depolarization in the heart.- First- Left side of the interventricular septum- Moves to right across the mid portion of the septum- Apex of heart- Along ventricular walls to AV groove Endocardium to epicardium- Last- Posterobasal portion of the left ventricle, pulmonary conus, uppermost portion of the septum. 