Arteries - carry blood away from the heart and veins carry blood back to the heart, Circulatory system - made up of blood vessels that carry blood away from and towards the heart, Veins - carry blood back to the heart, The heart - has four chambers, The two bottom chambers - are the right ventricle and the left ventricle, A wall - called the interventricular septum is between the two ventricles, The two top chambers - are the right atrium and the left atrium, A wall called the interatrial septum - is between the atria., The circulatory system is also called - the cardiovascular system,

Circulatory system

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