Final answer:
Serotonin, dopamine, and norepinephrine are all examples of neurotransmitters.
Step-by-step explanation:
Serotonin, dopamine, and norepinephrine are all examples of neurotransmitters. Neurotransmitters are chemical messengers that transmit signals between nerve cells in the brain and throughout the body. They play a crucial role in regulating mood, sleep, appetite, and many other physiological processes.
Learn more about neurotransmitters