heart - organ that pumps blood through the body, artery - blood vessel that carries blood away from the heart, vein - blood vessel that carries blood back to the heart, aorta - largest artery in the body, blood - carries oxygen and carbon dioxide through the body, artia - receiving chambers of the heart, ventricle - chamber that pumps the blood out of the heart, capillary - the smallest kind of blood vessel, red blood cell - carry oxygen to parts of the body, white blood cell - protects the body against foreign substances ,

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