What term refers to chemical messengers in the brain that transmit signals between neurons?

• A. Neurotransmitter
• B. Mindfulness based relapse prevention
• C. Matrix model
• D. Mandated treatment

Answer: (A)

In the brain, chemical messengers that transmit signals between neurons are neurotransmitters. When a neuron fires, these molecules are released into the synaptic gap, cross the space, and bind to receptor sites on the next neuron, either exciting or inhibiting its activity to pass the signal along. They’re cleared away after signaling through reuptake or enzymatic breakdown, which resets the system for the next message. Examples include dopamine, serotonin, GABA, glutamate, and acetylcholine. These messengers are central to how the brain controls mood, reward, and information flow, and disruptions in their signaling are tied to substance use disorders. The other terms refer to treatment approaches or programs, not the chemical messengers themselves.