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The figure shows an axon terminal and synapse. Select the option giving correct identifications of tables A-D.

1. A – Axon terminal; B – Serotonin complex
2. A – Action potential; C – Neurotransmitter
3. B – Neurotransmitter; D – Receptor capsules
4. C – Receptor; D – Synaptic vesicles

Correct answer: B – Neurotransmitter; D – Receptor capsules

Solution

In a synapse, neurotransmitters are the molecules released from the presynaptic terminal into the synaptic cleft. Receptor capsules are located on the postsynaptic membrane and bind those neurotransmitters, so the labels B and D match those structures.

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