Which of the following describes the trends of U.S. adolescent substance use from the last three decades?
a. Use of alcohol, cigarettes, and marijuana has declined.
b. Use of alcohol has declined, but use of cigarettes and marijuana has increased.
c. Use of alcohol and marijuana has increased but use of cigarettes has declined.
d. Use of alcohol, cigarettes, and marijuana has all increased.
Answer: A
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Which neurotransmitters are most important in the development of mood disorders?
a) GABA, endorphins, and serotonin b) acetylcholine, serotonin, and GABA c) dopamine, serotonin, GABA, and norepinephrine d) norepinephrine, acetylcholine, and serotonin
One major shortcoming of most of the research on sexual activity is that it
a. focuses primarily on quality of sexual relations at different ages. b. focuses primarily on many types of sexual expression besides intercourse. c. focuses only on males. d. focuses primarily on frequency counts of sexual activity.