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𝚔𝚒𝚍𝚅𝙰𝙼𝙿𝙸𝚁𝙴

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    3. Heart beat

    A heartbeat is a coordinated, electrical, and muscular process driven by the sinoatrial (SA) node (the heart's pacemaker), which sends electrical impulses causing the upper chambers (atria) to cont...

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