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External costs include _____________.
Neurotransmitters
Chemical substances that transmit signals across a synapse from one neuron to another in the brain and nervous system.
Dopamine
A neurotransmitter involved in the regulation of mood, pleasure, movement, and the reward system in the brain.
Serotonin
A neurotransmitter that plays an important role in mood regulation, as well as sleep, appetite, and digestion.
Depression
A psychiatric condition defined by a sustained low mood or apathy towards activities, significantly hindering daily operations.
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