Which of the following best describes an excitatory post-synaptic potential (EPSP)?
A) A change in membrane permeability that prevents a cell from producing an action potential.
B) A change in membrane potential as a result of increased membrane permeability to sodium ions.
C) A change in the membrane potential from -50mV towards -70mV.
D) A change in ion concentration such that there is an increase in intracellular potassium.
Anaswer: B