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main vein in body. Enters right atrium Vena Cava collects blood from body moves blood to right ventricle Right atrium pumps blood to lungs right ventricle moves blood to lungs pulmonary artery gas exchange blood picks up O2 & drops of Co2 lungs receives blood from lungs Left atrium pumps blood to body left ventricle main artery in body aorta carry blood away from <3 heart arteries drops off O2 and nutrients picks up Co2 capillaries carry blood to heart veins _________ system is closely related to circulatory system Respiratory the __________ provide huge surface area for gas and nutrient exchange capillaries