Refer to the Graphs Showing Action Potentials Occurring in Response

question 189

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.

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Physiological System

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