Brain scan studies with drug users
A. can show which people have developed dependence and which have not.
B. can predict which people will later develop dependence.
C. so far can only show changes in response to drug administration.
D. are very strong predictors of alcohol use, but not for other substances.
C
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Drugs that facilitate the activity of the synapses of a particular neurotransmitter are said to be __________ of that neurotransmitter
A) facilitators B) agonists C) antagonists D) autoreceptors E) endorphins
Courtney wears glasses to correct the farsightedness in her left eye. If she were not wearing her glasses,
a. the lens would focus images in front of the retina in her left eye. b. the pupil in her left eye would dilate and let in too much light energy. c. the lens would focus images behind the retina in her left eye. d. the pupil in her left eye would constrict and not let in sufficient light energy.