1. Which “reward system” is responsible for creating feelings of pleasure?
   
   

limbic system

nervous system

digestive system

circulatory system

1. Which neurotransmitter is released when the brain’s “reward system” is activated?
   
   

dopamine

serotonin

norepinephrine

epinephrine

1. According to PET scan results, what do cocaine addicts process less efficiently?
   
   

glucose

protein

carbohydrates

sucrose