Maximum velocity of conduction is seen in?

ANSWER: (D) Purkinje fibersREF: Guyton's physiology 22nd edition page 105Velocity of Signal Conduction in Cardiac Muscle:The velocity of conduction of the excitatory action potential signal along both atrial and ventricular muscle fibers is about 0.3 to 0.5 m/sec, or about 1/250 the velocity in very large nerve fibers and about 1/10 the velocity in skeletal muscle fibers. The velocity of conduction in the specialized heart conductive system-in the Purkinje fibers-is as great as 4 m/sec in most parts of the system, which allowTs reasonably rapid conduction of the excitatory signal to the different parts of the heart