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
Ventricular depolarization stas from: 
Select and explain. 
A. Posterolateral area of ventricle, B. Base of left ventricle, C. Right pa of interventricular septum, D. Left pa of interventricular septum
D: Left pa of interventricular septum
Answer: D: Left pa of interventricular septum 
Explanation: Ans. d. Left pa of interventricular septumVentricular depolarization stas from left pa of interventricular septumSpread of Depolarization in the VentriclesFirst to be depolarized is the left upper pa of the interventricular septum; septal depolarization is from left to right(2.The wave of depolarization spreads down the septum to the apex. proceeding from endocardium to epicardiumQLast pas of the ventricles to be depolarized arePosterobasal poion of the left ventricleQPulmonary conusQA small uppermost poion of the septumQ