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    lebtures's Avatar
    lebtures Posts: 1, Reputation: 1
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    #1

    Aug 19, 2010, 01:05 PM
    How the heart keep its rhythm
    What is the factor that causes the heart to keep its rhythm
    Devorameira's Avatar
    Devorameira Posts: 2,461, Reputation: 981
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    #2

    Aug 22, 2010, 08:59 AM

    The heart has its own pacemaker - the SAN (sino-atrial node) which is controlled by nervous impulses from the cardiac centre in the medulla of the brain.
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