What effect would a chemical that blocks voltage-gated sodium ion channels in a neuron's plasma membrane have on its membrane potential?
A) The membrane potential would become more positive because more sodium ions would leave the cell.
B) The membrane potential would become more negative because more sodium ions would leave the cell.
C) The membrane potential would become more positive because more sodium ions would enter the cell.
D) The membrane potential would become more negative because more sodium ions would enter the cell.
E) The membrane potential would not change because sodium could not enter the cell.
Answer: E
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