Post differentials. (a). A post differential may be granted on the basis of conditions of environment which differ substantially from conditions of environment in the continental United States and warrant additional pay as a recruitment and retention incentive.
We will also see that in order for a neuron to generate an action potential, the membrane potential has to depolarize from the resting value of around â70 mV to the threshold value of around â50 mV. A similar situation is also at play in muscle cells (skeletal, cardiac, and smooth).
So in the standard myocyte model this phase will be a horizontal line. This is what happens in 99% of cardiac cells, which are contractile cells. The resting membrane potential is caused by the difference in ionic concentrations and conductances across the cell membrane during phase 4 of the action potential. The normal resting membrane potential in the ventricular myocardium is about -85 to -95 mV.