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
What is the delay between the S-A node discharge and arrival of the action potential at the ventricular septum? 
Select and explain. 
A. 0.80 second, B. 0.16 second, C. 0.12 second, D. 0.09 second
B: 0.16 second
Answer: B: 0.16 second 
Explanation: The impulse coming from the S-A node to the A-V node arrives at 0.03 second. Then there is a total delay of 0.13 second in the A-V node and bundle system, allowing the impulse to arrive at the ventricular septum at 0.16 second