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GRE阅读题目解析:肾上腺素如何调节脑功能

2017-07-15 08:25:00来源:网络

  GRE阅读题目解析:肾上腺素如何调节脑功能】GRE考试考什么?GRE阅读是重点。新东方在线GRE频道为大家带来GRE阅读题目解析:肾上腺素如何调节脑功能,答案见下一页,希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

  查看全部:GRE阅读答案解析(汇总)

  GRE阅读题目解析:肾上腺素如何调节脑功能

  P5

  How can the hormone adrenaline that does not act directly on the brain have a regulatory effect on brain function? Recently, we tested the possibility that one of the hormone's actions outside the brain might be responsible. Since one consequence of adrenaline release in an animal is an increase in blood glucose levels, we examined the effects of glucose on memory in rats. We found that glucose injected immediately after training enhances memory tested the next day. Additional evidence was provided by negative findings: drugs called adrenergic antagonists, which block peripheral adrenaline receptors, disrupted adrenaline's ability to regulate memory but did not affect memory enhancements produced by glucose that was not stimulated by adrenaline. These results are as they should be if adrenaline affects memory modulation by increasing blood glucose levels. (131 words)

  10.The author refers to the results of the experiment using adrenergic antagonists as "negative findings" most likely because the adrenergic antagonists

  (A) failed to disrupt adrenaline's effect on memory

  (B) did not affect glucose's ability to enhance memory.

  (C) did not block adrenaline's ability to increase blood glucose levels

  (D) only partially affected adrenaline's ability to enhance memory

  (E) disrupted both adrenaline's and glucose's effect on memory

  点击下一页查看答案:

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