A) SA node
B) AV node
C) Purkinje fibre
D) Papillary muscles
Correct Answer: A
Solution :
The rate of heart beat is determined by SA node or sinoatrial node of myogenic muscles. These muscle from two nodes and a network called cardiac conduction system. SA node is a site of rhythmic impulse so is also called as pacemaker.You need to login to perform this action.
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