The cardiac conduction system is made up of four main structures that stimulate contraction of the heart muscle in a coordinated way. The sinoatrial node acts as the pacemaker and initiates electrical impulses throughout the heart. The atrioventricular node receives impulses from the atria and slows conduction to allow for filling of the ventricles before contraction. Specialized fibers called Purkinje fibers rapidly conduct electrical signals from the atrioventricular node to trigger…
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