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#edon lairtaonis #sa node #heart spark #cardiac impulse #heartbeat origin #electrical heart beat

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#edon lairtaonis #sa node #first pacemaker #primary node #heart conduction system hierarchy #main pacemaker

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#edon lairtaonis #sa node #heart beat initiation #start heartbeat #cardiac cycle start #heart ignition

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#edon lairtaonis #sa node #primary pacemaker #heart conductor #heart rhythm king #keith-flack node

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#edon lairtaonis #sa node #heart pacemaker #heart electricity #heart beat start #cardiac impulse