This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Conducting System of Hea, Subject name: Physiology
Last pa of the hea to be repolarised is: 
Select and explain. 
A. Apical epicardium, B. Apical endocardium, C. Epicardium of the base of LV, D. Endocardium of the base of LV
B: Apical endocardium
Answer: B: Apical endocardium 
Explanation: Depolarization occurs from apex to base & endocardium to epicardium; Repolarization occurs from base to apex & epicardium to endocardium Last to depolarize are: Base of LV (epicardium) Pulmonary conus. Upper most pa of interventricular septum. Last to repolarise: Apex endocardium