http://wiki.answers.com/Q/What_happens_if_your_circulatory_system_fails
http://kidshealth.org/teen/your_body/body_basics/heart.html
http://edhelper.com/ReadingComprehension_54_2862.html
http://wiki.answers.com/Q/How_do_you_keep_circulatory_system_healthy
http://hes.ucfsd.org/gclaypo/circulatorysys.html
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