If a neuron receives an excitatory signal, this A sets off an action potential down the axon. B depolarizes the neuron, making it more likely to fire. C makes the voltage of the neuron more negative, making it less likely to fire. D initiates the refractory period in the neuron.
Added by Erik S.
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An excitatory signal depolarizes the neuron, making it more likely to fire an action potential. Option A is incorrect because an excitatory signal doesn't necessarily set off an action potential immediately. It increases the likelihood of one. Show more…
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A neuron often receives a mix of EPSP and IPSP signals. What determines if the neuron has an action potential? A. If the excitatory signals are greater than the inhibitory signals, and depolarize the neuron the threshold B. If the amount of neurons providing excitatory signals is greater in number than the number of inhibitory signals C. If the excitatory signals arrive more quickly then do the inhibitory signals D. If the excitatory signal arrives on the neuron's axon, or on one of its dendrites
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The action potential propagates a signal down the axon, then dendrites receive external stimuli, and finally at the synapse, neurons interact with other cells by sending neurotransmitters.
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