The given diagram shows axon terminal and synapse. Here A, B, C, D and E respectively represent

It seems like your question is incomplete, and the specific details regarding the diagram or what A, B, C, D, and E represent are missing. However, I can provide a general idea about the components typically found in an axon terminal and synapse, and you can adjust or specify based on the context of your diagram or question.

In a typical diagram of an axon terminal and synapse, the following components often play a crucial role:

1. Axon Terminal (Presynaptic Neuron): This is the end part of the neuron where neurotransmitters are released.

2. Synaptic Cleft: The small gap between the axon terminal and the postsynaptic membrane where neurotransmitters diffuse across.

3. Receptors (Postsynaptic Neuron): These are protein molecules on the surface of the postsynaptic neuron that bind to neurotransmitters.

4. Vesicles: Small membrane-bound structures in the axon terminal that contain neurotransmitters.

5. Neurotransmitters: Chemical messengers that transmit signals across the synapse from one neuron to another.

If you can provide the context for A, B, C, D, and E based on your diagram or specific information, I'd be happy to help clarify or elaborate further!