Neurons do not make direct contact but are separated by synapses. Impulses cross a synapse by means of a neurotransmitter. Describe the process of neurotransmitter release at a synapse. You may use a labelled diagram.
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Action potential arrives at axon terminal of presynaptic neuron
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Voltage-gated Ca2+ channel opens
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Ca2+ enters the cell
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Ca2+ signals to vesicles
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Vesicles move to the membrane
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Neurotransmitters are released by exocytosis
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Neurotransmitters diffuse across the synaptic cleft and bind to receptors on the postsynaptic membrane
CM
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