Each heartbeat begins with a single, electrical impulse, or "spark." The distinctive sound we hear through a stethoscope, or when we place our head on a loved one's chest, is the sound of the heart valves opening and closing in perfect synchronicity with each other. It is a two-party rhythm - a delicate dance of systole and diastole, which propels the heart's electrically charged particles through its chambers roughly every second of the day, every day of our lives.
Jessi Kirby, Things We Know by Heart
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