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A cardiac impulse leads to the contracti...

A cardiac impulse leads to the contraction and relaxation of the heart. Which of the following arrow diagrams correctly represents the flow of cardiac impulse in the heart?

A

SA node `rArr` contraction of auricle `rArr` AV node `rArr` bundle of HIS `rArr` Purkinje fibres `rArr` contraction of ventricle

B

SA node `rArr` AV node `rArr` contraction of auricle `rArr` purkinje fibres `rArr` bundle of HIS `rArr` contraction of ventricle

C

SA node `rArr` contraction of auricle `rArr` bundle of HIS `rArr` AV node `rArr` purkinje fibres `rArr` contraction of ventricles

D

SA node `rArr` AV node `rArr` bundle of HIS `rArr` purkinje fibres `rArr` contraction of auricle `rArr` contraction of ventricle

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The correct Answer is:
A
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