Multiple Choice
Assume a hypothetical postsynaptic neuron has three presynaptic inputs, X, Y, and Z. When presynaptic neurons X and Y are stimulated simultaneously, the postsynaptic neuron reaches threshold and undergoes an action potential; yet, when presynaptic neurons X and Z are stimulated simultaneously, there is no change in potential of the postsynaptic neuron. Which of these statements correctly describes the presynaptic neurons Y and Z?
A) Presynaptic neurons Y and Z are both excitatory.
B) Presynaptic neurons Y and Z are both inhibitory.
C) Presynaptic neuron Y is excitatory, and presynaptic neuron Z is inhibitory.
D) Presynaptic neuron Y is inhibitory, and presynaptic neuron Z is excitatory.
Correct Answer:
Verified
Correct Answer:
Verified
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