Like an action potential, an EPSP results from:
A) sodium ions entering the cell.
B) potassium ions entering the cell.
C) sodium ions exiting the cell.
D) potassium ions exiting the cell.

Question

Quizplus · Accepted Answer

EPSPs, or excitatory postsynaptic potentials, are depolarizations of the postsynaptic membrane that make the cell more likely to fire an action potential. This depolarization is typically caused by the influx of positively charged ions, such as sodium, into the cell through ligand-gated ion channels in the postsynaptic membrane. Therefore, choice A - sodium ions entering the cell - is the correct answer.

Like an Action Potential, an EPSP Results From