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A diagram showing axon terminal and synapse is given. Identify correctly at least two of A-D.

1. B-Synaptic connection, D-K+
2. A-Neurotransmitter, B-Synaptic cleft
3. C-Neurotransmitter, D-Ca++
4. A-Receptor, C-Synaptic vesicles

Correct answer: A-Neurotransmitter, B-Synaptic cleft

Solution

A neurotransmitter is the chemical released from synaptic vesicles at the axon terminal, and the synaptic cleft is the narrow gap between the presynaptic and postsynaptic cells. Those two labels therefore fit the diagram correctly.

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