It’s a question that’s not often asked because the process itself seems as natural as breathing: How does the heart beat? Part of the answer to this question is it’s made possible by the heart’s electrical system, which is critical to the function of the organ in that it determines the heart rate and coordinates the beating of heart muscles, according to cardiac electrophysiologist Ian Weisberg, M.D. Image source: Pixabay.com The electrical system of the heart is composed of three parts, namely the sinoatrial (SA) node, or nature’s pacemaker; the atrioventricular (AV) node, or a gate-like barrier that slows the electrical signal before entering the ventricles; and the His-Purkinje Network, a pathway of fibers sending the impulse to the ventricles’ muscular walls and leading them to contract. At rest, you can expect the heart to beat some 50 to 100 times per minute. Several factors can cause your heart to beat faster, including exercising, extrem...
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