<prompt> Speed of conduction is fastest in-AV nodeSA nodeBundle of HisPurkinje system  <response>: Ans. is d i.e., Purkinje system Cardiac tissueConduction velocity metersecondSA node0 ? 05Inteatrial pathways1Atrial muscle0 ? 30AV node0 ? 05 minimumBundle of His1Purkinje system4 maximumVentricular muscle1 