dopamine

definition: 
A compound present in the body as a neurotransmitter and a precursor of other substances including adrenaline
sentence: 
These drugs all act in the brain to stimulate receptors that recognize the chemical messenger substance dopamine. The ability of the brain to absorb or produce chemicals such as dopamine or serotonin is what leads to the illness.
difficulty: 
medium
toefl frequency: 
1
toefl classification: