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
SA node
AV node
Bundle of HIS
Purkinje fibers
Heart: Rhythmical Excitation of the Heart