首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
When the heart breaks down, it beats irregularly or not at all. A bone can chip or snap. But when the complex network of neurons
When the heart breaks down, it beats irregularly or not at all. A bone can chip or snap. But when the complex network of neurons
admin
2013-07-30
59
问题
When the heart breaks down, it beats irregularly or not at all. A bone can chip or snap. But when the complex network of neurons in our brain fails to work, the result can be a near-endless variety and combinations of mental illnesses.
It is normal to sometimes be sad, happy, anxious, confused, forgetful or fearful, but when a person’s emotions, thoughts or behavior frequently trouble them, or disrupt their lives, they may be subject to mental illness. According to the World Health Organization(WHO), about 450 million people worldwide are affected by mental, neurological or behavioral problems at any time.
However, determining that someone has a mental illness, and which one, is one of the challenges psychiatrists face.
Historically, some symptoms of mental illness, such as eccentric behavior and hearing voices, have been taken as evidence of heavenly communication or demonic(恶魔的)possession.
More recently, brain scans have directly linked these conditions with changes in levels of neurotransmitters — chemicals that convey messages across neurons — or alterations in the number or structure of neurons in different brain areas. For instance, people suffering from depression often display lowered levels of the neurotransmitter serotonin(血清素).
In a few cases, the immediate cause of the malfunction has been identified. Alzheimer’s disease, a major source of dementia and memory loss in the elderly, is caused by the accumulation of protein plaques which choke neurons in the brain.
Some infectious diseases can also develop into a mental illness. Untreated HIV infection can cause dementia, as can the uncontrolled replication of the germ that causes syphilis(梅毒).
In many cases the precise cause is unclear and experts suspect that many different factors are involved. The chance that identical twins both develop schizophrenia(精神分裂症)is much higher than that for fraternal twins or siblings, proving the strong role of inherited genes. But scientists are accumulating a growing list of other risk factors that predispose people to this condition, including prenatal exposure to famine conditions, certain infections or exposure to lead. The season of their birth also seems important — birth in winter or early spring increases the risk, as does an older father and, controversially, child abuse.
Genes are also thought to influence many other mental health problems, including: anorexia, autism, Alzheimer’s disease and bipolar disorder.
Some researchers believe that smoking cigarettes and taking recreational drugs may elevate a user’s risk of mental illnesses.
What are neurotransmitters responsible for according to the passage?
选项
答案
Conveying messages across neurons.
解析
由题干中的neurotransmitters将本题出处定位到第五段首句。该句提到…neurotransmitters—chemicals thatconvey messages across neurons。破折号起解释说明的作用,其后的chemicals指的就是前面的neurotransmitters,that引导的定语从句修饰chemicals并说明它的作用。由此可知,that后的内容为本题答案出处。由于问题是整句,所以需要把动宾结构的convey messages across neurons转化为名词短语,并大写首字母,故答案为Conveying messages across neurons.。
转载请注明原文地址:https://kaotiyun.com/show/rG97777K
0
大学英语六级
相关试题推荐
A、Peopleworkinginalargefactory.B、Peoplewalkingoncrowdedcitystreets.C、Aneverydayactivityinasmalltown.D、Awell-
A、Thegirl’sfriend.B、Theiranothersister.C、Theboy’sdreamgirl.D、Apopstar.CWhoisStella?
A、Saturday.B、Sunday.C、Monday.D、Tuesday.A细节题。男士明确提到说IwenthikingSaturday.(我在星期六那天去徒步旅行了。)答案是A。
A、Sheoffersherhelptotheman.B、Shehastobeoncrutchesforsixweeks.C、ShebrokeheranklelastTuesday.D、Sheshowsher
Manymanufacturers_________________________(过于专注降低成本而受到了指责),oftenattheexpenseofthequalityoftheirproducts.
Thewordscienceisheardsoofteninmodemtimesthatalmosteverybodyhassomenotionofitsmeaning.Ontheotherhand,itsd
A、Terrible.B、Shocking.C、unforgettable,D、Cherished.DWhichwordcannotbeusedtodescribetheirfeeling?
Thatexperiencesinfluencesubsequentbehaviorisevidenceofanobviousbutneverthelessremarkableactivitycalledremembering
ChoosingUniversitiesorSpecialties1.进入大学前,很多学生面临是选择学校还是选择专业的问题2.对此问题不同的人有不同的看法3.你对此的看法
A、Thetailor’s.B、Adress-upparty.C、Thetheatre.D、Ashoppingmail.C听到女士说的thecurtaingoesup“升幕,开演”,可知他们的目的地是theater,故选C。其余选
随机试题
Inourcontemporaryculture,theprospectofcommunicatingwith—orevenlookingat—astrangerisvirtuallyunbearable.Everyone
文明生产是要求每个生产者在劳动生产中严格按有组织办事。()
女性,25岁。妊娠5个月,因转移性右下腹痛2小时就诊。经检查诊断为急性阑尾炎。其治疗措施错误的是
有关毒性的叙述,错误的是
患者,男,42岁。胃脘胀痛,攻痛连胁,嗳气频作,并呕逆酸苦,二便如常,舌苔薄白,脉沉弦。治疗应首选( )。
甲为一富商之子(16岁),其借给乙10万元,其向丙借款10万元,其在醉酒状态下将自己的价值20万的罗马表以100元的价格卖给丁,其立下遗嘱将祖父赠与的一套别墅遗赠给女朋友戊。下列表述错误的是:()
某大型防洪工程由政府投资兴建。项目法人委托某招标代理公司代理施工招标。招标代理公司依据有关规定确定该项目采用公开招标方式招标,招标公告在当地政府规定的招标信息网上发布。招标文件中规定:投标担保可采用投标保证金或投标保函方式担保。评标方法采用经评审的最低投标
下列说法中,正确的选项有________。
以“我设计的房子”为活动内容,拟订一个大班美术教育活动计划。
[*]
最新回复
(
0
)