the heart - It is a muscular organ with four chambers that pumps blood around the body, the veins - They carry blood with carbon dioxide back to the heart., the arteries - They carry blood with oxygen, from the heart to the body, the capillaries - they are tiny blood vessels that connect arteries and veins together and allow the gases exchange., the blood - It is a red liquid made of plasma, red and white blood cells and platelets, red cells - They carry oxygen through the arteries, white cells - They fight against infections, plateles - They help the blood to clot and form scabs,

CIRCULATORY SYSTEM: What does blood do?

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