A postsynaptic neuron has three presynaptic inputs - from neurons X,Y and Z.When X and Y are stimulated simultaneously and repeatedly,the postsynaptic neuron reaches threshold and undergoes an action potential.When X and Z are stimulated simultaneously,however,there is no change in the membrane potential of the postsynaptic neuron.The simultaneous stimulation of X and Y is an example of
A)Temporal summation
B)Presynaptic inhibition
C)Spatial summation
D)Neuronal divergence
E)None of the choices are correct

Question

Quizplus · Accepted Answer

Spatial summation occurs when multiple presynaptic neurons (X and Y in this case) fire at the same time and their combined effects bring the postsynaptic neuron to threshold, resulting in an action potential.

A Postsynaptic Neuron Has Three Presynaptic Inputs - from Neurons