When two action potentials arrive simultaneously at two different presynaptic terminals that synapse with the same postsynaptic neuron,
A) the direction of the action potential is reversed.
B) temporal summation occurs.
C) spatial summation occurs.
D) hyperpolarization occurs.
E) threshold is never reached.

Question

Quizplus · Accepted Answer

Spatial summation occurs when two or more action potentials arrive simultaneously at two different presynaptic terminals that synapse on the same postsynaptic neuron, effectively combining their effects to possibly reach the threshold for an action potential in the postsynaptic neuron.

When Two Action Potentials Arrive Simultaneously at Two Different Presynaptic