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
High Stress May Damage Memory According to a report issued in May 1998, elderly people who have consistently high blood leve
High Stress May Damage Memory According to a report issued in May 1998, elderly people who have consistently high blood leve
admin
2010-01-14
61
问题
High Stress May Damage Memory
According to a report issued in May 1998, elderly people who have consistently high blood levels of cortisol don’t score as well on memory tests as their peers with lower levels of the stress hormone. What’s more, high levels of cortisol are also associated with shrinking of the hippocampus, a region of the brain that plays a key role in learning and memory.
The findings suggest that even cortisol levels in the normal, "healthy" range can actually accelerate brain aging.
The study results "now provide substantial evidence that long-term exposure to adrenal stress hormones may promote hippocampal aging in normal elderly humans," write Nada Porter and Philip Land- field of the University of Kentucky in Lexington in their editorial. Cortisol is a hormone released in response to stress by the adrenal glands ,which sit on top of the kidneys.
Over a 5 to 6-year period ,Dr. Sonia Lupien and his colleagues measured 24-hour cortisol levels in 51 healthy volunteers ,most of whom were in their 70s.
Despite wide variation in cortisol levels, the participants could be divided into three subgroups, those whose cortisol progressively increased over time and was currently high (increasing/high); those whose cortisol progressively increased over time and was currently moderate (increasing/moderate); and subjects whose cortisol decreased, but was currently moderate (decreasing/moderate).
The researchers tested the volunteers’ memory on six people in the increasing/high category and five people in the decreasing/moderate group. The groups did not differ on tests of immediate memory, but the increasing/high cortisol group had other memory problems compared with those in the decreasing/moderate group.
The researchers also found that the total, volume of the hippocampus in those in the increasing/high group was 14 % lower than those in the decreasing/moderate group, although there were no differences in other brain regions.
The results suggest that "... brain aging can be accelerated by levels of adrenal hormones that are not generally regarded as pathological and that variation within, this normal range is related to variation in the rate of brain aging,’ write Porter and Landfield. "This further, suggests that chronic stress may accelerate the worsening of hippocampus. ’
31. The part of the brain important for a person’s learning, and memory is
选项
A、the cortisol.
B、the adrenal glands.
C、the stress hormones.
D、the hippocampus.
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/pSmd777K
本试题收录于:
职称英语卫生类A级题库职称英语分类
0
职称英语卫生类A级
职称英语
相关试题推荐
Listentothefollowingdescriptionoffivepeopleanddecidewhatkindofpersoneachis.Forquestions9~13,choosethewo
DEALINGWITHWASTEPLASTICEveryyearpeoplethrowawaymillionsoftonnesofplasticbottles,boxesandwrapping.Thesecr
DEALINGWITHWASTEPLASTICEveryyearpeoplethrowawaymillionsoftonnesofplasticbottles,boxesandwrapping.Thesecr
DEALINGWITHWASTEPLASTICEveryyearpeoplethrowawaymillionsoftonnesofplasticbottles,boxesandwrapping.Thesecr
"Peter,you’veeatenalltheice-cream?saidhismother.accusedPeter’smother____________________alltheice-cream.
THOMASEDISONOnthenightof21October1931,millionsofAmericanstookpartinacoast-to-coastceremonytocommemorate
Lookingforanewhome?ATidmarshThissix-bedroom,nineteenth-centuryhouse,justoutsidethevillageofTidmarsh,isaver
WILLIAMTHEHERO!BraveWilliamBaldock,whoissixyearsold,isaheroafterhelpinghismotherwhenshefelldownstairs
WILLIAMTHEHERO!BraveWilliamBaldock,whoissixyearsold,isaheroafterhelpinghismotherwhenshefelldownstairs
WILLIAMTHEHERO!BraveWilliamBaldock,whoissixyearsold,isaheroafterhelpinghismotherwhenshefelldownstairs
随机试题
慢性支气管炎可以引起()
下列肢体测量方法中,哪项是错误的
药物利用指数(DUI)大于1,可以提示
大货车的净宽要求为()。
某公司2014年自行计算的会计利润为一2万元,经税务师事务所审计后发现以下事项:企业将12月15日购入的设备在当月计提了折旧5万元,当年发生的公益性捐赠5万元。经税务师事务所作纳税调增的其他项目金额30万元。则该公司2014年可以在企业所得税前列支的公益性
()是我国市场经济条件下大力提倡并得以广泛使用的一种合同形式,它具有公开、公平、公正的特点,能够提高物品采购合同的透明度。
既是海上画派的代表人物,又曾担任西泠印社首位社长的艺术家是()。
A.switchingtoB.flourishC.marketplacePhrases:A.whichcompanieswill【T1】______B.whohavetheoptionof【T2】______trucks
PrintFormat(1234.56,"###.#")语句的输出结果是
A、Atapublicforum.B、Inanauditorium.C、OnTV.D、Inaclassroom.C综合推断题。女士在对话开始欢迎男士到他们的节日之中,接下来还提到了电视观众(viewers),由此推断,这段访问应该是
最新回复
(
0
)