Examlex
All of the following are broad classes of rock except
Dopamine
A neurotransmitter in the brain that plays a major role in reward-motivated behavior, movement, and cognitive functions.
Testosterone
The male sex hormone, high levels of which have been linked to aggression and violence in both animals and humans.
Serotonin
A neurotransmitter that plays a key role in regulating mood, appetite, sleep, and other functions within the body.
Testosterone
A steroid hormone that plays a key role in the development of male reproductive tissues and secondary sexual characteristics, though it is present in both sexes.
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