Which of the following statements concerning the differences between action potentials in skeletal muscle cells and in ventricular cardiac muscle cells is TRUE?
A. Like skeletal-muscle cells, ventricular cardiac-muscle cells have a resting membrane potential closer to the sodium equilibrium potential than to the potassium equilibrium potential.
B. Unlike skeletal-muscle cells, the initial depolarization of ventricular cells is mainly due to calcium influx, not sodium influx.
C. After sodium influx through voltage-gated channels occurs in ventricular cells, a prolonged influx of calcium occurs. No such calcium influx occurs in skeletal muscle cells.
D. Action potentials in skeletal muscle cells are longer in duration than action potentials in cardiac muscle cells.
E. The efflux of K+ repolarizes skeletal muscle cells after an action potential, while repolarization in cardiac muscle cells is due to the efflux of Ca2+.

The difference between action potentials in skeletal muscle cells and in ventricular cardiac muscle cells is that the action potential of cardiac muscles is for a lesser duration than skeletal muscle. Thus, option D is correct.

The skeletal muscles have been present in the body that has been responsible for the skeleton movement. The cardiac ventricular muscles have been the muscles of the heart ventricles.

The difference between the skeletal muscle cells and in ventricular cardiac muscle cells can be given as:

The skeletal muscles and cardiac muscles have the resting membrane potential of -90 mV, which has been close to the potassium equilibrium. Thus statement A is incorrect.

The depolarization of the ventricular cells has been based on the movement of the sodium ion outside the cells. Thus, statement B is incorrect.

The skeletal muscle has been able to transfer the signal through the Ca efflux by the acetylcholine signals. Thus, statement C is incorrect.

The action potential of cardiac muscles lasts for msec, while the action potential for skeletal muscle lasts for 2-5 sec. Thus, statement D is correct.

The repolarization of the cardiac muscles has resulted in an increase in the permeability of the cell for Potassium. Thus, statement E is incorrect.

The difference between action potentials in skeletal muscle cells and in ventricular cardiac muscle cells is that the action potential of cardiac muscles is for a lesser duration than skeletal muscle. Thus, option D is correct.

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