The driving force for blood circulation is contraction of the ventricles contraction of the atria closing of thr AV valv
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The driving force for blood circulation is contraction of the ventricles contraction of the atria closing of thr AV valv
The driving force for blood circulation is contraction of the ventricles contraction of the atria closing of thr AV valves opening of the AV valves closing of the aortic valve
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