A Hypothetical Postsynaptic Neuron Has Three Presynaptic Inputs¾X, Y, and Z

Multiple Choice

A hypothetical postsynaptic neuron has three presynaptic inputs¾X, Y, and Z. When X and Y are stimulated simultaneously, the postsynaptic neuron undergoes an action potential, yet when X and Z are stimulated simultaneously, there is no change in the postsynaptic neuron's potential. What can you tell about neurons Y and Z?

A) Y and Z are both excitatory.
B) Y and Z are both inhibitory.
C) Y is excitatory and Z is inhibitory.
D) Y is inhibitory and Z is excitatory.
E) Not enough information to answer.