Which of the following best describes why neurotransmitters are necessary?
A. Because electrical signals cannot cross the synapse.
B. Because they increase the speed of neural propagation.
C. Because they reduce depolarization thresholds.
D. Because neurons have refractory periods during which communication must still occur.
Answer: A
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A researcher uses an anonymous survey to investigate the study habits of American college students. Based on the set of 56 surveys that were completed and returned, the researcher finds that these students spend an average of 4.1 hours each week working on course material outside of class. For this study, the average of 4.1 hours is an example of a(n) ____
a. parameter b. statistic c. population d. sample
In Vygotsky's theory, when there is NO zone of proximal development for a particular activity, it implies that
a. the child suffers severe confusion. b. instructional tutoring is essential. c. independent discovery learning is effective. d. the child is not sufficiently mature to learn it.
Jack has agreed to purchase a new car for $18,000. However, just before he gets ready to sign the contract, the salesman tells Jack that the sales manager will not approve the amount allowed for his trade-in, and that the contract will have to be
higher, probably around $19,000. Jack has just been the victim of the ________. a) lowball technique b) door-in-the-face technique c) that's-not-all technique d) foot-in-the-door technique
In "broken heart syndrome," ______
a. sudden surges in cholesterol rapidly clog previously healthy arteries leading to sudden death b. the person's brain unconsciously "wills" the heart and lungs to stop working c. stress hormones "stun" the heart, preventing it from pumping normally d. people's blood pressure skyrockets, causing sudden, massive, and usually fatal strokes