托福阅读材料：人体脑白金

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1、托福阅读材料：人体脑白金小马过河为人家准备了“托福阅读材料:人体脑白金”，供备考托福的考生们参考使用,来提高白己的托福成绩！免费咨询电话：400-0123-267Melatonin,sometimescalledthehormoneofdarknoss,”playsanimportntroleinrcgulatingourdailysleeppatterns.Thishormoncisproducedbyourbodiesandinmostorganismsmelatoninproductionishigherduringthenight

2、thanduringtheday.褪黑索，又名黑素细胞凝集索的荷尔蒙,在调节我们日常睡眠规律中扮演重要角色。人体自身分泌褪黑激素，而且大多数生物夜晚比白天分泌得更多。Inadditiontotheirbody'sownmelatonin,manypeopletakemelatoninsupplementsinanattempttohelpthemsleep,fightjetlagorbalanceoutseasonalaffectivedisorder.此外，一些人通过体外补充褪黑索改善睡眠，缓解飞机时差感、平衡季节性情绪失调。Melat

3、oninAndMemories褪黑素对记忆的影响Butastudybyagroupofscientistsatthe5iversityofHoustonsuggeststhatmclatoninmighthaveanegativeimpactontheabilitytoformnewmemories・但是，休斯顿大学的科学家们研究表明：褪黑索阻碍记忆形成。Theresearcherswereinterestedinhowthebody"sinternalclockaffectstheformationofnewmemories・Theyf

4、oundthatsmtillstripedminnowscalledzebrafishlearnedverywelldurin£thedaybutverypoorlyatnight,whenmelatoninlevelsarehigher・研究人员想弄清楚体内生物钟如何影响新生记忆的形成。研究人员发现斑马鱼白天学习能力很好;夜晚却很差，而夜晚褪黑索分泌旺盛。Theywonderedifmelatoninplayedaroleinlearningandmemory.研究人员怀疑褪黑素影响学习和记忆。MelatoninAndLearning褪

5、黑索对学习的影响Theytreatedzebrafishwithextramelatoninduringtheday,boostingthehormonelevelstonight-timeamounts.口天，研究人员喂给斑马角褪黑素，促进斑马角夜晚褪黑素分泌。Theydiscoveredthathighmelatonindidnotaffectlcarningpersc,butdramaticallyreducedthefishes'abilitytoformnewmemories,ortorememberwhattheyJdlear

6、ned・研究人员发现大量的褪黑索没有直接影响学习本身，但是却很大程度地使斑马鱼的记忆衰退，斑马鱼不记得学过的东西。Thenthescientistsinhibitedmelatoninactivityinthefish・Theydidthisbyblockingmelatoninreceptorswithinhibitorydrugs・Thefishs，melatoninlevelswereunchanged,buttheabi1ityofmelatonintoaffectthebrainwasblocked・接着，科学家们抑制斑马鱼体内

7、的褪黑索的作用：抑制药物阻碍褪黑索受体。斑马鱼褪黑索分泌虽没改变，但是褪黑素不能影响不了大脑。BlockingMelatonin阻碍褪黑素Withmelatoninactivityblocked,theabilityofthefishtoformnewmemorieswasdrasticallyimproved,evenatnight・褪黑索的作用受阻，斑马鱼新生记忆能力明显改善，夜晚也很好。Thisresearchhaspotentialbenefitsforhumtins.Forexample,theuseofmelatoninrec

8、eptorblockerscouldimproveperformanceofnight-timecognitivetasks,helpingpeoplesuchasnight-shiftwor