Decreasing the extracellular sodium makes the resting membrane potential disappear. It tends to become less negative. Only a minute change is seen because the resting neuron is not very permeable to sodium.
Sodium is a soft silvery-white metal in nature. In the nerve cells, Sodium (Na+) is critical for the action potential. Action potentials are recursively initiated as the extracellular concentration of Sodium ion Na+ is modified. As the quantity of sodium in the extracellular solution is decreased its action potential decreases as well. Therefore, the quantity of sodium is inversely proportional to its action potential.
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