Question

fill in the blank question
arrow
is indicating neurotransmitter receptors; arrow
is indicating a neurotransmitter molecule, and arrow
indicates a synaptic vesicle.

Explanation:

• Synaptic vesicles are small membrane - bound sacs in the axon terminal that store neurotransmitters. In the diagram, structure A is a circular structure within the neuron's axon terminal, which is characteristic of a synaptic vesicle.
• Neurotransmitter molecules (small blue dots in the diagram) are released from synaptic vesicles. Structure B represents these neurotransmitter molecules.
• Neurotransmitter receptors are proteins on the postsynaptic membrane that bind to neurotransmitters. Structure C, which has a shape complementary to the neurotransmitter (like a lock - and - key mechanism), represents the neurotransmitter receptors.

Answer:

Arrow A is indicating a synaptic vesicle. Arrow B is indicating a neurotransmitter molecule, and arrow C is indicating neurotransmitter receptors.