![]() ![]() Impulse from the SA Node to the AV node, causes an impulse in the AV node. This signal travels across the atria causing them to contract and load the ventricles with blood.Ītrio-ventricular node (AV node) The AV node is a second bundle of excitatory muscle cells. Sinoatrial node (SA node) This specialized excitatory muscle cells make an electric impulse.
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