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1. Sinoatrial node
2. Atrioventricular node
3. Atrioventricular bundle
4. Right and left bundle branches
5. Purkinje fibers

This answer may be acceptable for high school, but in university you'll have to go further as such:

1. Sinoatrial node

2. Posterior, anterior, lateral internodal pathway + Bachmann's bundle

3. Penetrating Atrioventircular node

4. Distal Atrioventricular node

5. Left and right bundle branches of Purkinje fibers (or: left and right Bundles of His)

6. Purkinje fibers

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