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7:08
Khan Academy
Brooke Miller
Overview of psychoactive drugs
Psychoactive drugs, altering consciousness and perceptions, fall into four groups: depressants, stimulants, hallucinogens, and opiates. Depressants slow brain activity, while stimulants increase alertness. Hallucinogens distort perceptions and opiates, like depressants, slow nervous system functions but also reduce pain. The classification isn ...
Jul 15, 2015
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