Which of the following is true of withdrawal symptoms?
A) Withdrawal symptoms are usually the opposite of the effects of the drug.
B) Withdrawal can be seen in the absence of tolerance.
C) Withdrawal symptoms are not an indicator of physical tolerance.
D) Withdrawal symptoms are less intense versions of the normal effects of a drug.
E) Most addictive drugs produce similar withdrawal symptoms.
Question 2
Which of the following is a common explanation for tolerance in heroin addiction?
A) increased brain levels of the drug with repeated use
B) the body's attempt to compensate for the effects of the drug
C) the loss of homeostatic regulation after taking drugs
D) the drug is metabolized less efficiently with repeated use
E) heroin is more slowly cleared from the brain with repeated treatments
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