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
About This Quote

The heart beats because of the electrical current sent through it by the nerves in the vagus nerve. The vagus nerve keeps the heart beating in roughly the same rhythm, by sending electrical signals to the heart, telling it how to beat. The heart has three chambers that are also electrical in nature. They all work together to keep the heart beating. When you hear your heart beat, it's not just one strong sound coming from one spot in your body, but rather there are many sounds all happening at once.

Source: Things We Know By Heart

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