Na+/K+ pump is an ATPase
Phosphate bond hydrolysis ΔG=−30.5 kJ/mol
it pumps 3 Na+ and 2 K+ against their respective electrochemical gradients.
this is a form of active transport and does not depend on the gradients unless the
energy stored in a phosphate bond is comparable to the gradient...
The membrane has negligible/leaky permeability to K+ at rest. K+ permeability increases
AFTER the influx of Na+
Also if the membrane is fully permeable to K+ then it won't be at the resting membrane potential. K+ will move out as it is less concentrated outside the cell, this efflux causes...
Na+ IS repelled by the excess of Na+ and other positive charges. Only you have to factor
in permeability.
Neurons are designed to maintain a negative resting membrane potential. Meaning they have
channels that open only at specific threshold voltages. Extracellular signals at the synapse...