A) AV node
B) SA node
C) Bundle of His
D) Purkinje fibres
Correct Answer: B
Solution :
'Pace-maker' is the name given to the bundle of modified cardiac muscles which influences the heart beat. The muscle fibre of SA node (Sinu Atrial node) possess the highest rhythmicity among all cardiac muscle fibres and can initiate excitory waves or heart beat at the highest rate. So, SA node is the pace-maker, which initiates each cardiac cycle and there by sets the basic pace of the heart beat. AV node (Arrio Ventricular node) is another contraction node or the other parts of conducting system in mammals, which shows rhylhmicity after spreading of impulse over the atria to reach AV node. After reaching to AV node, cardiac impulse runs along the AV bundle, called as bundle of His and then passes to its branches and Purkinje fibres to reach the ventricular muscle fibres.
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