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

question 169

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.

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