What are the four methods by which psychoactive drugs may enter our bloodstream?

answer the following questions, separately
1. What are the four methods by which psychoactive drugs may enter our bloodstream?
2. What are the three phases our bodies go through when we are under the influence of
psychoactive drugs?
3. Which division of the nervous system is primarily altered by the effects of psychoactive drugs?
4. What are the major classes of psychoactive drugs?
5. Briefly describe how amphetamines and cocaine differ in how they work to produce their
psychoactive effects on our bodies.
6. Briefly describe how nicotine and caffeine differ in how they work to produce their psychoactive
effects on our bodies.
7. Briefly explain how morphine and alcohol are similar in how they work to produce their
psychoactive effects on our bodies.
8. Identify and explain the two ways one can develop “tolerance” to psychoactive drugs.
9. Which two areas of the brain, and which neurotransmitters are involved in addiction to
psychoactive drugs such as morphine?
10. According to research on the mechanisms of drug addiction, what is the most critical factor in
addiction?

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