Depolarization of human ventricular muscle starts from: (A) Posterobasal part of ventricle, (B) Left side of interventricular septum, (C) Uppermost portion of interventricular septum, (D) Basal portion of ventricle
Answer is B. 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.