The Cardiac Conduction System
The system of nerves that work together to set the heart rate and stimulate muscle cell depolarization within the heart.
This diagram of the cardiac conduction system indicates the SA node, AV node, left posterior bundle, right bundle, Purkinje fibers, His bundle, and Bachmann's bundle.
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"ConductionsystemoftheheartwithouttheHeart-en.svg."
https://en.wikipedia.org/wiki/Sinoatrial_node#/media/File:ConductionsystemoftheheartwithouttheHeart-en.svg
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