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Cardiac contraction is initiated by impulses generated at the SA node in the heart's conduction system.
Cardiac contraction is initiated by impulses automatically generated at the SA node under normal conditions. The SA node, also known as the cardiac pacemaker, is located in the upper wall of the right atrium and is responsible for initiating the wave of electrical stimulation that leads to atrial contraction. This electrical impulse then travels to the AV node, followed by the atrioventricular bundle, Purkinje fibers, and the ventricles, resulting in a coordinated contraction of the heart.
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