Final answer:
The heart's internal conduction system includes the SA node, AV node, and Purkinje fibers, crucial for coordinating heart contractions.
Explanation:
The internal conduction system of the heart involves the sinoatrial (SA) node, atrioventricular (AV) node, and Purkinje fibers. When the SA node initiates an action potential, it travels through the atria, reaches the AV node where there's a delay, then passes through the AV bundle to the Purkinje fibers, leading to ventricular contraction.
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