Neuron a and Neuron B Synapse with Neuron C

question 218

Multiple Choice

Neuron A and Neuron B synapse with neuron C. You are measuring the electrical activity in Neuron C. When Neuron A fires, there is a depolarization observed in Neuron C, but not enough to generate an action potential. But when Neuron A and Neuron B fire at the same time, there is an action potential generated in Neuron C. How can we explain this?

• A) Measurement error on the first observation.
• B) The synaptic connection for Neuron B is actually at the axon.
• C) Neuron A depolarizes the postsynaptic membrane, but Neuron B hyperpolarizes it.
• D) Neuron A hyperpolarizes the postsynaptic membrane, but Neuron B depolarizes it.
• E) The graded potentials from Neuron A and Neuron B sum together to reach the depolarization necessary for an action potential.

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