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Circulatory
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Respiratory
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Digestive
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Excretory
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Skeletal
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Muscular
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Nervous
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Endocrine
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Immune
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Integument
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Reproductive
http://hubpages.com/hub/AMAZING_HUMAN_FACTS
Scientists have counted over 500 liver functions. The liver is often called the body's chemical factory.
Image Source:
http://creationwiki.org/Biological_system
