<prompt> True statement regarding purkinje fibres:September 2009, March 2013Are myelinated fibresHave action potential about a tenth as long as those in the hea muscleHave conduction velocity of four times than that of the hea muscleAll of the above  <response>: Ans. C: Have conduction velocity of four times than that of the hea muscleConduction rate is 4 ms in purkinje fibers whereas it is 1 ms in ventricular muscles, atrial pathways and Bundle of His. SA Node and AV Node has a conduction speed of 0.05 ms 