Assume that a hypothetical neuron has three presynaptic inputs converging upon it. Presynaptic inputs A and B are excitatory, and C is inhibitory. Indicate which of the following changes will take place by writing the appropriate letter in the blank using the answer code below:
-What would occur if both presynaptic neurons A and B were fired simultaneously?
A)There will be no change in potential of the postsynaptic cell.
B)Spatial summation will occur.
C)Temporal summation will occur.

Question

Quizplus · Accepted Answer

When both presynaptic neurons A and B are fired simultaneously, their excitatory inputs will summate spatially at the postsynaptic neuron, resulting in a larger depolarization and increased likelihood of an action potential. The inhibitory input from presynaptic neuron C may also affect the ultimate outcome, but the question only asks about what will occur with the firing of A and B.

Assume That a Hypothetical Neuron Has Three Presynaptic Inputs Converging