A hypothetical postsynaptic neuron has three presynaptic inputs->X, 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 logically conclude?
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.
C
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