True statement regarding purkinje fibres:September 2009, March 2013

A. Are myelinated fibres

B. Have action potential about a tenth as long as those in the hea muscle

C. Have conduction velocity of four times than that of the hea muscle

D. All of the above

Correct Answer: Have conduction velocity of four times than that of the hea muscle

Description: Ans. C: Have conduction velocity of four times than that of the hea muscleConduction rate is 4 m/s in purkinje fibers whereas it is 1 m/s in ventricular muscles, atrial pathways and Bundle of His. SA Node and AV Node has a conduction speed of 0.05 m/s

Category: Physiology

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