Circulatory System, 10th August 2010, http://hes.ucfsd.org/gclaypo/circulatorysys.html
Heart and Circulatory System, 10th August 2010, http://biology.about.com/library/organs/blcircsystem4.htm
Circulatory System, 14th August 2010, http://library.thinkquest.org/2935/Natures_Best/Nat_Best_High_Level/Circulatory_Net_Pages/Circulatory_page.html
The circulatory system, 17th August 2010, http://www.globalclassroom.org/hemo.html
The heart and the circulatory system, 19th August 2010, http://biology.about.com/library/organs/blcircsystem4.htm
Why is the Circulatory system important to Humans?, 19th August 2010, http://www.ehow.com/about_5432715_circulatory-system-important-humans.html
All about the cardiovascular system, 21st August 2010, http://www.becomehealthynow.com/article/bodycardio/699/
That is all the sources I used for this assignment :)
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