Examlex
The optimal arousal theory states that individuals are motivated to:
Rates Of Drug Use
The prevalence or frequency of drug consumption within a particular population over a specified period of time.
Immune System
The complex network of cells, tissues, and organs in the body that works together to defend against infection, disease, and foreign substances.
Macrophage
A type of white blood cell that engulfs and digests cellular debris, foreign substances, microbes, and cancer cells.
Serotonin
A neurotransmitter in the brain involved in regulating mood, appetite, and sleep, among other functions. Low levels are associated with depression.
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