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The sinoatrial (SA) node maintains and establishes the heart's rhythm. The SA node emits pulses of current through gap junctions in cardiac tissue to stimulate atrial contractions. The pacemaker emits a 1ms pulse of 2A current every second. If the gap junction has a approximate resistance of 10 Ω , how much energy is dissipated by the cardiac muscle? a) 0.04 J b) 40 J c) 20 J d) 0.02 J

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