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
[{'content': 'What is the normal total delay of the cardiac impulse in the A-V node + bundle? \nSelect and explain. \nA. 0.22 second, B. 0.18 second, C. 0.16 second, D. 0.13 second', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The impulse from the S-A node travels rapidly through the internodal pathways and arrives at the A-V node at 0.03 second, at the A-V bundle at 0.12 second, and at the ventricular septum at 0.16 second. The total delay is thus 0.16 second', 'role': 'assistant'}]