soon after taking a psychoactive drug, larisa's breathing slowed, her pupils constricted, and her feelings of anxiety were replaced by blissful pleasure. larisa most likely experienced the effects of

Answer :

Larissa most likely experienced the effects of Heroin shortly after taking a psychoactive drug.

Psychoactive drugs are substances that, when consumed or administered to the body, alter mental processes such as perception, consciousness, cognition, mood, and emotions. Psychoactive drugs are part of a larger class of psychoactive substances that also includes alcohol and nicotine. They cause temporary changes in mood, perception, and behaviur by altering brain function.

The drug affects three brain neurotransmitters: serotonin, dopamine, and norepinephrine (noradrenaline). When the drug enters the brain, the neurotransmitters are released from synaptic vesicles in neurons. As a result, neurotransmitter activity increases.

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