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.

Spatial Summation

Summation of the local potentials in which two or more action potentials arrive simultaneously at two or more presynaptic terminals that synapse with a single neuron.

Action Potentials

Electrical impulses that travel along the membrane of nerve cells, allowing them to communicate with other cells.

Presynaptic Terminals

The end points of nerve cells (neurons) where neurotransmitters are released to transmit signals to other neurons or muscles.