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13 questions from this quiz
Events in the heart during one heartbeat
Two
Both are relaxed
Vena cava and pulmonary veins
Open
Closed
Atria contract, pushing blood into ventricles
To prevent backflow into the atria
Deoxygenated blood into pulmonary artery
Oxygenated blood into the aorta
Superior and inferior vena cava
Pulmonary veins
Improves efficiency and strength
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