Assertion: cardiac muscle's action potential | /r/HasProperty | recorded in ventricular muscle fiber
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text: The action potential recorded in a ventricular muscle fiber, shown in Figure 9-3, averages about 105 millivolts, which means that the intracellular potential rises from a very negative value, about -85 millivolts, between beats to a slightly positive value, about +20 millivolts, during each beat.