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Biology, 04.07.2019 10:00 Bashirar19
Need 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 (left atrium, right atrium, right and then moves down. the presence of the (atrioventricular valve, valves in the aorta, valves in the prevents the backflow of blood inside the heart
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