Which of the following is the order of activation after stimulation of Purkinje fibers is: (A) Septum → Endocardium → Epicardium, (B) Endocardium → Septum → Epicardium, (C) Epicardium → Septum → Endocardium, (D) Septum → Epicardium → Endocardium
Answer is A. Order of depolarization in the heart.
-        First- Left side of 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.