The resting potential of the cardiac muscle has a higher magnitude than the resting potential of the neuron

Sodium ions play no role in the depolarization of the action potential shown in inset (b).

Cardiac action potentials have a plateau phase, while neuronal action potentials do not.

The action potential of a neuron is considerably shorter in duration than the action potential of the cardiac muscle

The refractory period in the action potential shown in inset (a) is due to the efflux of potassium ions and an influx of calcium ions.