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7:08
Khan Academy
Brooke Miller
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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 ...
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