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).
Calcium ions (Ca2+) link action potentials in a muscle fiber to contraction. 1  In resting muscle fibers, Ca2+ is stored in the endoplasmic (sarcoplasmic) reticulum. 2  Spaced along the plasma membrane (sarcolemma) of the muscle fiber are inpocketings of the membrane that form T-tubules.