Negatively charged ions are not permitted to enter the neuron when it fires because the

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The neuron is selectively permeable, meaning it only allows certain ions to enter or exit the cell. When a neuron fires, it causes a change in the membrane potential that allows positively charged ions to enter the cell, while negatively charged ions are kept out. This is due to the selective permeability of the neuron's membrane.

Negatively Charged Ions Are Not Permitted to Enter the Neuron