Option d Depolarization membrane become more Depolarization positive when Na+ diffuses into cell.
Because sodium is a positively charged ion, it will cause a change in the relative voltage between inside and outside the cell. Because the resting potential is the membrane's state at a voltage of 70 mV, sodium cation entering the cell causes it to become less negative. Neurotransmitters that open Na+ channels tend to make the Depolarization membrane potential more positive, while those that activate K+ channels tend to make it more negative; those that inhibit these channels tend to have the opposite effect.
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