<prompt> Slowest conduction velocity in which part of conducting system-AV nodePurkinje fibresBundle of hisVentricular myocardial fibres  <response>: Ans. is a i.e., AV node Speed of conduction is slowest in AV node and SA node.Cardiac tissueConduction velocity metersecondSA node0 ? 05Inteatrial pathways1Atrial muscle0 ? 30AV node0 ? 05 minimumBundle of His1Purkinje system4 maximumVentricular muscle1 