Why S.A node is called pacemaker of heart
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It controls the heart rate by generating electrical impulses and then sending electrical signals through the heart muscle, causing the heart to contract and pump blood throughout the body. The heart beat originates from S.A. node and spreads to the walls of auricles which contract.
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The electrical impulse which causes heart beat,starts/ begins in SA node i.e sinoatrial node. So this node is known as "natural pacemaker".
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