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Heart
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===About the Heart===
: The '''heart''' is mostly [[muscle]].
: The [[muscle]]s in the '''heart''' squeeze and relax to pump [[blood]].
{| class="wikitable"
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|[[File:HeartBloodFlow.png|center|400px200px]]|[[File:CG_Heart.gif|center|400px]]
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| style="height:20px; width:300px200px; text-align:center;" |A [[diagram]] showing the [[blood]] flow through the [[heart]].| style="height:20px; width:300px400px; text-align:center;" |A computer generated animation of the [[heart]] pumping.
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