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    HOW HEART BEATS

    0  Views: 703 Answers: 1 Posted: 13 years ago

    1 Answer

    http://kidshealth.org/kid/htbw/heart.html


    http://heartdisease.about.com/od/palpitationsarrhythmias/ss/electricheart.htm


    http://my.clevelandclinic.org/heart/heartworks/heartbeat.aspx

    hector5559

    Peter Sellers use to know,


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