The heart impulse is initiated and carried forward to the ventricles. The correct order of conduction of this impulse is:

1
SA Node → AV Node → Purkinje Fiber -→ AV Bundle
2
SA Node → Purkinje Fiber -→ AV Node -→ AV Bundle
3
SA Node → AV Node → AV Bundle → Purkinje Fiber
4
SA Node → Purkinje Fiber -→ AV Bundle → AV Node

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