where electrical impulse starts; natural pacemaker
controls the heart beat
contraction of the atria
electrical wave that shows the contraction of the ventricles
a wave on the cardiac cycle that indicates ventricular relaxation
bundle of His
bundle of fibers that goes along the septum to the apex
bundle of electrical fibers where electrical signals are sent then relayed to the Bundle of His
causes ventricles to contract
picture of the electrical system of the heart
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