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entire myocardium acts as single unit do to cardiac muscles being connected by gap junctions
intrinsic conduction system/nodal system
consists of specialized non-contractile myocardial tissue, ensures heart contracts (depolarizes) orderly, beats as coordinated unit
graphic recording of electrical changes during cardiac cycle; records time & voltage only
heart rate below 60 bpm, athletes is ok, can train to increase stroke volume w/ lower heart rate
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