This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Depolarization of human ventricular muscle starts from 
Select and explain. 
A. Posterobasal part of ventricle, B. Left side of interventricular septum, C. Uppermost portion of interventricular septum, D. Basal portion of ventricle
B: Left side of interventricular septum
Answer: B: Left side of interventricular septum 
Explanation: 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.