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One major difference between the action potential of cardiac muscle fibers and the action potential of skeletal muscle fibers is that in cardiac muscle fibers

One major difference between the action potential of cardiac muscle fibers and the action potential of skeletal muscle fibers is that in cardiac muscle fibers Correct Answer depolarization is prolonged compared to that in skeletal muscle fibers

C In cardiac muscle fibers, depolarization is prolonged compared to that in skeletal muscle fibers. Eliminate because the membrane is permeable to both Na+ and K+. Choice (B) can also be eliminated; in cardiac muscle fibers, voltage-gated K+ channels open during repolarization. Finally, (D) is wrong because the refractory period is longer in cardiac muscle fibers compared to skeletal muscle fibers.

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