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Biology 2.2 (the heart (double circulatory system (the larger second one,…
Biology 2.2
the heart
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pace maker
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cells produce a small electric impulse that spreads to the surrounding muscles causing them to contract
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little device implanted under the skin with a wire going to the heat producing electric current to keep the heart beating regularly
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the lungs
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alveoli
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blood passing has just come from the rest of the body so contains lots of carbon dioxide and little oxygen
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