Select the First Step for Synaptic Signaling When the Action

question 135

Multiple Choice

Select the first step for synaptic signaling when the action potential arrives at the axon terminal of a presynaptic neuron.

• A) A neurotransmitter is released by exocytosis.
• B) Calcium flows into the synaptic knob.
• C) The neurotransmitter combines with protein receptor sites on the subsynaptic membrane.
• D) The permeability is altered in a postsynaptic neuron.
• E) The neurotransmitter is synthesized.

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