Physiology If the Purkinje fibers, situated distal to the A-V junction, become the pacemaker of the hea, what is the expected hea rate? A 30/min B 50/min C 60/min D 70/min 💡 Explanation If the Purkinje fibers, situated distal to the A-V junction, become the pacemaker of the hea, what is the expected hea rate? ✓ Correct Answer: A. 30/min