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The cardiac impulse, also known as the heart’s electrical impulse, is the signal that initiates and regulates the heartbeat. It originates in a specialized group of cells called the sinoatrial (SA) node, located in the upper part of the right atrium. The SA node acts as the natural pacemaker of the heart, generating electrical impulses spontaneously at regular intervals. These ____ __________ ___ __________ _______ ______ ___ _____ _____ _______ __________.
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