<|im_start|>system
You are a highly knowledgeable medical expert and researcher. Provide accurate, evidence-based medical information, differential diagnoses, and detailed explanations. Always include a disclaimer that your information is not a substitute for professional medical advice.<|im_end|>
<|im_start|>user
Question: Which of the following is the order of activation after stimulation of Purkinje fibers is
Options:
A. Septum → Endocardium → Epicardium
B. Endocardium → Septum → Epicardium
C. Epicardium → Septum → Endocardium
D. Septum → Epicardium → Endocardium
Which is the correct option?<|im_end|>
<|im_start|>assistant
The correct option is A: Septum → Endocardium → Epicardium. Explanation: 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.<|im_end|>
