When stating that the neuron's membrane is polarized, you are referring to a difference in electrical potential between:

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When we say that the neuron's membrane is polarized, we are referring to a difference in electrical potential between the inside and the outside of the membrane. Specifically, there tends to be a greater concentration of positively charged ions (such as sodium ions) outside the membrane and a greater concentration of negatively charged ions (such as potassium ions) inside the membrane. This creates an electrical gradient across the membrane known as the resting potential.

When Stating That the Neuron's Membrane Is Polarized, You Are