Heart - Hollow, muscular organ that pumps blood throughout the body, Vein Return/Volver  - blood vessels that carry blood back to the heart, Artery Away  - Blood vessels that carries blood Away from the heart , Capillaries - Tiny narrow blood vessels where substances are exchanged between the blood and body cells , blood - A complax fluid mixture that includes cells dissolved food and gases cellular wastes proteins, enzymes and hormones. Blood helps transport substances through the body  , Circulatory System ,

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