When listening to a heartbeat it consists of two thumps. Is it contracting twice very quickly or is the second thump caused by something else?
In: Biology
Those sounds are the sounds of valves closing. Basically, you have to upper chambers, and two lower chambers. The top two squeeze first, then the bottom two. Their valves snap shut closely together, making two distinct heart sounds. You can sometimes hear them more individually. It’s not the heart beating twice; it’s different parts of the heart making their sounds through the progression of the heart beat.
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