Given the inconsistent evidence about levels of neurotransmitters in people with mood disorders, researchers have begun to focus research efforts on
a) whether specific levels of serotonin or dopamine are important.
b) understanding the types of people who have no disturbances in their absolute levels of neurotransmitters.
c) finding a new neurotransmitter.
d) the sensitivity of postsynaptic receptors.
d
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Most adolescents who experience their parents' divorce
A) also experience living in a stepfamily. B) are likely to live in a single-parent home until they grow up. C) have fewer problems if the custodial parent remarries. D) get more attention if the custodial parent remarries.
Which of the following statements concerning the maturation of the reproductive system is true?
a. Early menstrual cycles are usually regular. b. Boys' initial ejaculations usually contain sufficient sperm to fertilize an egg. c. In the first months of menstruation, girls do not usually ovulate. d. At about age 17, boys have their first spontaneous ejaculation.