Chapter 5 - 9. One night in years ago (The First Fire-Part 3)
Author's Note
Himawari_Shima
I was way wrong in my own understanding about heartbeat until making this chapter.
[The sound of a heartbeat is caused by the heart valves opening and closing as they pump blood. The heartbeat sounds a bit like lub-DUB, lub-DUB. The" lub" is the sound of the tricuspid and mitral valves closing. The" DUB" is the sound of the aortic and pulmonary valves closing. -Dr. Mehmet Oz,
https://www.sharecare.com/health/circulatory-system-health/causes-the-sound-of-heartbeat
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