This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Heart, Circulation, and Blood, Subject name: Physiology
Speed of conduction is fastest in- 
Select and explain. 
A. AV node, B. SA node, C. Bundle of His, D. Purkinje system
D: Purkinje system
Answer: D: Purkinje system 
Explanation: Ans. is 'd' i.e., Purkinje system Cardiac tissueConduction velocity (meter/second)SA node0 [?] 05Inteatrial pathways1Atrial muscle0 [?] 30AV node0 [?] 05 (minimum)Bundle of His1Purkinje system4 (maximum)Ventricular muscle1