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51. Choose the correct statement regarding the ionic mechanisms of the cardiac cell action potential: A. The initial depolarization occurs due to the transient opening of K channels B. The initial repolarization occurs due to the rapid opening of fast sodium channels C. The final repolarization occurs due to slow opening of calcium channels D. The final repolarization signifies the reversal of the sign of the charge inside the cell, which becomes positive E. The final repolarization is due to the efflux of potassium ions
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