Discuss the components and significance of the cardiac conduction system, including the roles of the SA node, AV node, and Purkinje fibers.

The cardiac conduction system is a specialized network of electrical pathways in the heart that ensures coordinated contraction and efficient pumping of blood. This system is essential for maintaining rhythmic heartbeats and includes the sinoatrial (SA) node, atrioventricular (AV) node, bundle of His, bundle branches, and Purkinje fibers.  

The sinoatrial (SA) node, located in the right atrium near the superior vena cava, acts as the natural pacemaker of the heart. It generates electrical impulses at a rate of about 60-100 beats per minute _____ _______ ___ _______ _____ _____ _________.
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