Final answer:
The resting membrane potential of cardiac contractile cells is more negative than that in neurons. Contractile cells have a more stable resting phase compared to conductive cells.
Step-by-step explanation:
The resting membrane potential of cardiac contractile cells is more negative than that it is in neurons. Contractile cells demonstrate a much more stable resting phase than conductive cells at approximately -80 mV for cells in the atria and -90 mV for cells in the ventricles. Despite this initial difference, the other components of their action potentials are virtually identical.