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Rainbow [258]
3 years ago
7

What is the lub-dub sound of a heartbeat

Health
1 answer:
trapecia [35]3 years ago
4 0
Ive read that the -The “ lub<span>” is the first </span>heart sound<span>, commonly termed S1, and is caused by turbulence caused by the closure of mitral and tricuspid valves at the start of systole. The second </span>sound<span>,” </span>dub<span>” or S2, is caused by the closure of aortic and pulmonic valves, marking the end of systole.</span>
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