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Biology, 26.06.2019 18:00 KingMack1136
The heart is a muscular organ that pumps blood. blood that contains waste materials is brought to the heart by blood vessels. this blood enters the __1__ and then moves down. the presence of the __2__prevets the backflow of blood inside the heart 1. right atrium left atrium right ventricle 2. atrioventricular valve valves in the aorta valves in the veins
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