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 2prevets 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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The heart is a muscular organ that pumps blood. blood that contains waste materials is brought to th...