The fact that only positively charged sodium ions enter the neuron when it fires demonstrates that neurons are

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The fact that only positively charged sodium ions can enter the neuron when it fires indicates that the neuron has a selectively permeable membrane. This means that the membrane is able to choose which substances can enter and exit the cell. In this case, only positively charged sodium ions are allowed to enter the neuron, while negatively charged ions are not.

The Fact That Only Positively Charged Sodium Ions Enter the Neuron