A Postsynaptic Neuron Has Three Presynaptic Inputs - from Neurons

question 80

Multiple Choice

A postsynaptic neuron has three presynaptic inputs - from neurons X,Y and Z.When X and Y are stimulated simultaneously and repeatedly,the postsynaptic neuron reaches threshold and undergoes an action potential.When X and Z are stimulated simultaneously,however,there is no change in the membrane potential of the postsynaptic neuron.What can you tell about presynaptic neurons Y and Z?

• A)They are probably both excitatory
• B)They are probably both inhibitory
• C)Y is probably excitatory and Z is probably inhibitory
• D)Z is probably excitatory and Y is probably inhibitory

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