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Anatomy & Physiology - Essential Study Partner
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Anatomy & Physiology ESP 2.iso
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TRM2.dxr
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00315_Field_TRM2S4B text.txt
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1999-11-20
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The timing of the heartΓÇÖs beating is coordinated by special conducting fibers. The two atria contract as a unit slightly before the two ventricles do so. The SA node is the pacemaker, which initiates each heartbeat.