Which of the following statements accurately describes the primary function of neurotransmitters?

The first three statements are directly supported: neurotransmitters cross synapses, the target is another neuron, and acetylcholine is named. The slides do not provide a complete synthesis pathway, so that claim goes beyond the available material.\n\n**Key takeaway:** Use the stated definition and named example, while avoiding unsupported mechanistic claims.\n\n**Glossary:** **Synthesis pathway**: The sequence of processes by which a substance is produced; **target**: The recipient of a signal.