A Postsynaptic Neuron Has Three Presynaptic Inputs - from Neurons

question 33

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. The simultaneous stimulation of X and Y is an example of

• A) temporal summation.
• B) presynaptic inhibition.
• C) spatial summation.
• D) neuronal divergence.
• E) presynaptic facilitation.

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