The membrane has open K channels, and changing extracellular K concentration results in a change in membrane potential. Changing the extracellular Na concentration does not significantly change the membrane potential. What do your results suggest about the number or state (open or closed) of Na channels in the resting membrane of a neuron?

Answer: Closed

Explanation:

At resting membrane potential (RMP) sodium channels remained shut, this is because, previously in depolarisation, the voltage gated sodium channels were opened for sodium to diffuse into the Axon. However these channels closed after reaching their refractory period, s.

Therefore a change in the extracellular concentration of sodium will not open them