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What are heart beats caused by?

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Anonymous

15y ago
Updated: 8/18/2019

The 'lub' is caused from turbulence of the blood in the ventricles once they have contacted.

The 'dub' is the backflow of blood against the semi-lunar valves in the pulmonary artery and aorta once it has been squeezed out by the ventricles.

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Wiki User

15y ago

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