heart - the organ that pumps blood to the rest of your body, atria - blood enters the heart through two upper chambers called..., ventricles - blood leaves the heart through two lower chambers called..., arteries - vessels that carry blood away from you heart are the..., veins - vessels that bring blood to the heart are the..., capillaries - tiny vessels that enable oxygen CO2, & nutrients are the..., circulatory system - transports nutrients & oxygen to all the parts of the body,

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