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List the conduction sequence in its correct order.
ASA node, internodal pathways, AV node, AV bundle, bundle branches
BAV node, SA node, bundle branches, AV bundle, Purkinje fibers
CSA node, AV bundle, AV node, Purkinje fibers, bundle branches
DAV bundle, internodal pathways, SA node, AV node, apex fibers
Answer & Solution
Correct answer: A. SA node, internodal pathways, AV node, AV bundle, bundle branches
1. The impulse starts at the sinoatrial node, the pacemaker.
2. It travels the internodal pathways to the atrioventricular node, then the atrioventricular bundle.
3. From the bundle it enters the right and left bundle branches and finally the Purkinje fibers.
4. Every distractor breaks that chain somewhere, usually by firing the AV structures first.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 19 "The Cardiovascular System: The Heart", section 19.2 Cardiac Muscle and Electrical Activity_
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