Biology for IGCSE & O level - Coordination And Response (Section 9 - No. 1)
What best describes the sequence of events at a synapse?
Neurotransmitters released, impulse travels to pre-synaptic neuron, neurotransmitters received.
Impulse arrives at pre-synaptic neuron, neurotransmitters released, impulse travels to post-synaptic neuron, neurotransmitters received.
Impulse travels to post-synaptic neuron, neurotransmitters released, neurotransmitters received.
Neurotransmitters received, impulse arrives at pre-synaptic neuron, neurotransmitters released.
Explanation
The presynaptic neuron's axon terminal releases neurotransmitters, which diffuse across the synaptic cleft and bind to receptors on the postsynaptic neuron.
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