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==The electric discharge of the heart==
==The electric discharge of the heart==
[[Image:conduction_system_en.png|thumb|300px|The conduction system of the heart]]
[[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.

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