The nurse is teaching a beginning ECG class to staff nurses. As the nurse begins to discuss the parts of the ECG complex, one of the students asks what the normal order of conduction through the heart is. The correct response would be which of the following?

SA node, AV node, bundle of His, right and left bundle branches, and the Purkinje fibers

SA node, AV node, bundle of His, the Purkinje fibers, and the right and left bundle branches

AV node, SA node, bundle of His, right and left bundle branches, and the Purkinje fibers

SA node, AV node, right and left bundle branches, bundle of His, and the Purkinje fibers