Refer to the Graphs Showing Action Potentials Occurring in Response

Multiple Choice

Refer to the graphs showing action potentials occurring in response to multiple excitatory postsynaptic potentials (EPSPs) . In graph A, the action potential is due to

A) the action of each EPSP, which raises the membrane potential above its threshold.
B) the spatial summation of several simultaneous EPSPs.
C) the number of synapses on the cell body.
D) the rapid succession of EPSPs at one synapse.
E) the lack of inhibitory synapses.