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electrical impulses generated by specialized nodal tissue that travel through the heart wall
causing the myocardium to contract the heart chambers in a coordinated fashion
sinoatrial (SA) node
fires an electrical impulse that travels through the walls of the atria, signaling both the atria to contract and push blood into the ventricles
lies in the upper right atrium
sends impulse to the AV node
atrioventricular (AV) node
receives impulse from SA noded
lies between the atria and the ventricles
holds the electrical impulse for a fraction of a second allowing the atria to relax
sends the impulse down to the atrioventricular bundle
atrioventricular bundle (Bundle of His)
receives impulse from AV node
branches into the Purkinje fibers at the bottom of the ventricles
signal both the ventricles to contract and push blood out to the lungs and to the rest of the body
when the atria contract at the same time as the ventricles relax
beats about 60-80 times per minute
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