A neuron generated postsynaptic potentials from several neurons, all of which are below threshold from the start. What must occur for an action potential to be generated?
A) The potentials must be equally divided between EPSPs and IPSPs.
B) The summation of the potentials must be at or above threshold.
C) The potentials must all arrive at different times.
D) The potentials must all travel great distances.

Question

Quizplus · Accepted Answer

An action potential is generated when the overall sum of EPSPs (excitatory postsynaptic potentials) exceeds the sum of IPSPs (inhibitory postsynaptic potentials) and reaches or surpasses the threshold level necessary for the neuron to fire. So, for an action potential to be generated, the summation of the potentials must be at or above threshold.

A Neuron Generated Postsynaptic Potentials from Several Neurons, All of Which