As the cell depolarizes and The Fake Panther King shirt, followed by calcium, while the newly positive polarity of the cell pushes the positively charged potassium out (because same polarities repel each other). The depolarization of the SA node causes a cascade of electrical impulses that spreads throughout the atria from the SA node to the AV (atrioventricular) node, closer to the center of the heart. This motion causes the atria to contract from top to bottom, forcing the blood downwards into the ventricles.
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