In the cardiac conduction system, the electrical impulse starts in the sinoatrial node and moves to the:

 

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Correct

- atrioventricular node.

- Purkinje fibers.

- right or left bundle branches.

- bundle of His.

Rationale

In the cardiac conduction system, the impulse begins in the sinoatrial node near the atria of the heart and moves down to the atrioventricular node, which is approximately the level of the junction between the atria and the ventricles. From this point, the impulse travels to the bundle of His, followed by the right or left bundle branches, and finally, the Purkinje fibers.

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