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Biology, 30.08.2021 17:00 random456

13. What causes a heartbeat?………… A. Stretching of the atrium and ventricle muscles
B. Closing and opening of AV and SV Valves
C. Oxygenated blood
per minute
D. The number of times your heart beats

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13. What causes a heartbeat?………… A. Stretching of the atrium and ventricle muscles
B. Closin...
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