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Origin of heart beat and its conduction ...

Origin of heart beat and its conduction is represented by:

A

AV node `to` Bundle of His `to` SA node `to ` Purkinje fibres

B

SA node `to` Purkinje fibres`to ` AV node `to` Bundle of His

C

Purkinje fibres `to` Purkinje node `to` AV fibres `to` Bundle of His

D

SA node `to` AV node `to` Bundle of His `to` Purkinje fibres

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