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veins; arteries ; nutrients; capillaries; away; heat; transport; oxygen; energy; dark; circulatory; lungs; to; carbon dioxide; light; blood; heart; pumped intestine, atmosphere All animals need to to (11) materials around to the different parts of their body. This is the job of the (12) system. The circulatory system consists of a liquid called (13) a pump called the (14)_ and a series of vessels called (15) and (16) One thing that must be transported around is a gas called (17) Oxygen enters the blood through the (18) It is then (19) through the heart and around the body where it is used along with food to make (20) The body produces another gas called (21) which is a waste product . This gas is carried back to the heart and then to the lungs where it is released back into the (22) The vessels that transport blood (23) from the heart are called arteries. The color of blood in arteries is (24) red because it is rich in oxygen. The vessels that transport blood (25)_ the heart are called veins. The color of the blood in veins is (26) red because it is low in oxygen. The (27) are small vessels that join the arteries and veins.
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