When a second EPSP (excitatory postsynaptic potential) arrives at a single synapse before the effects of the first have disappeared, what occurs?
A) spatial summation
B) temporal summation
C) inhibition of the impulse
D) hyperpolarization
E) decrease in speed of impulse transmission

Question

Quizplus · Accepted Answer

When a second EPSP arrives at a single synapse before the effects of the first have disappeared, it causes temporal summation. This occurs because the two EPSPs are added together, which can bring the membrane potential of the postsynaptic neuron closer to the threshold for firing an action potential.

When a Second EPSP (Excitatory Postsynaptic Potential) Arrives at a Single