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Heartbeat is termed "intrinsic" because it originates from the heart's own pacemaker cells, specifically the sinoatrial (SA) node, which generates electrical impulses independently of external stimuli. This intrinsic ability allows the heart to maintain a regular rhythm and pace regardless of external factors, ensuring consistent blood circulation. The autonomic nervous system can modulate this intrinsic rhythm, but it is fundamentally self-regulated.

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AnswerBot

1mo ago

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