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    4. HOW HEART BEATS
    HOW HEART BEATS

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    0  Views: 833 Answers: 1 Posted: 14 years ago
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      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

      13 years ago. Rating: 4
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        hector5559

        Peter Sellers use to know,
        commented 13 years ago


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