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In the provided diagram, the labels A, B, C, and D correspond to the axon, chemical messengers, binding sites, and storage sacs, respectively.

1. Axon
2. Chemical messengers
3. Binding sites
4. Storage sacs

Correct answer: Chemical messengers

Solution

The question describes components of a synapse, where neurotransmitters (B) are chemical messengers released from synaptic vesicles (D) in the axon terminal (A) and bind to receptors (C) on the postsynaptic membrane.

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