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.

Question

Quizplus · Accepted Answer

If X and Y together can cause an action potential, then both X and Y must be excitatory. Additionally, if X and Z together cannot cause an action potential, but X and Y can, then Z must be inhibitory. Therefore, Y is excitatory and Z is inhibitory. Choice C is the only option that accurately reflects these conclusions.

A Hypothetical Postsynaptic Neuron Has Three Presynaptic Inputs-X, Y, and Z.When