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==The electric discharge of the heart== | ==The electric discharge of the heart== | ||
[[Image: | [[Image:conduction_system.svg|thumb|300px|The conduction system of the heart]] | ||
'''The sinoatrial node (SA node) contains the fastest physiological pacemaker cells of the heart; therefore, they determine the [[Rate|heart rate]].''' | '''The sinoatrial node (SA node) contains the fastest physiological pacemaker cells of the heart; therefore, they determine the [[Rate|heart rate]].''' | ||
'''First the [[heart|atria]] depolarize and contract. After that the [[heart|ventricles]]''' depolarize and contract. | '''First the [[heart|atria]] depolarize and contract. After that the [[heart|ventricles]]''' depolarize and contract. | ||