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
Slowest conduction velocity in which part of conducting system- 
Select and explain. 
A. AV node, B. Purkinje fibres, C. Bundle of his, D. Ventricular myocardial fibres
A: AV node
Answer: A: AV node 
Explanation: Ans. is 'a' i.e., AV node * Speed of conduction is slowest in AV node and SA node.Cardiac tissueConduction velocity (meter/second)SA node0 [?] 05Inteatrial pathways1Atrial muscle0 [?] 30AV node0 [?] 05 (minimum)Bundle of His1Purkinje system4 (maximum)Ventricular muscle1