Final answer:
The resting membrane potential for most neurons is -70 mV, established by the movement of K+ and Na+ ions across the neuronal cell membrane and maintained by the sodium-potassium pump.
Step-by-step explanation:
The value for the resting membrane potential for most neurons is -70 mV. This negative potential is crucial for the function of neurons and is established by the different concentrations of ions, particularly sodium (Na+) and potassium (K+), across the neuron's cell membrane. While K+ predominantly influences this potential due to its higher permeability through the membrane via leakage channels, Na+ ions also contribute but to a lesser extent due to fewer leakage channels available for them. The sodium-potassium pump plays a vital role in maintaining this resting potential, transporting K+ ions into the cell and Na+ ions out of it, and sets up the concentration gradients for these ions.