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
51
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. ’
33. According to the article, when people feel too worried or nervous or when they overwork,
选项
A、the adrenal glands will produce a stress hormone.
B、the kidneys will produce adrenal glands.
C、the hippocampus will produce high levels of cortisol in the blood.
D、the brain will work more effe4tive~y’
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/4Smd777K
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
Listentothefollowingdescriptionoffivepeopleanddecidewhatkindofpersoneachis.Forquestions9~13,choosethewo
Youwillhearfivepeopletalkingabout"HowtoSlowDownthePaceofLife".Forquestions9-13,choosefromthelistA~Fw
DEALINGWITHWASTEPLASTICEveryyearpeoplethrowawaymillionsoftonnesofplasticbottles,boxesandwrapping.Thesecr
DEALINGWITHWASTEPLASTICEveryyearpeoplethrowawaymillionsoftonnesofplasticbottles,boxesandwrapping.Thesecr
WILLIAMTHEHERO!BraveWilliamBaldock,whoissixyearsold,isaheroafterhelpinghismotherwhenshefelldownstairs
WILLIAMTHEHERO!BraveWilliamBaldock,whoissixyearsold,isaheroafterhelpinghismotherwhenshefelldownstairs
YouwillhearSusannaleavingaphonemessageforhermother.Listenandcompletequestions21-25.Youwillheartheinformation
随机试题
房产平面控制测量可选用()等测量方法。
如何改善沥青混合料的高温稳定性?
(2009年)两根完全相同的细长(大柔度)压杆AB和CD如图5—73所示,杆的下端为固定铰链约束,上端与刚性水平杆固结。两杆的弯曲刚度均为EI,其临界载荷Fa为()。
案例某公司经营危险化学品,拥有一个危险化学品库区和一个零售门市部。危险化学品库区分为东、西区两个部分,东区储存危险化学品,西区为普通商品仓库和配套的辅助用房。库区总占地面积11000m2,总建筑面积3400m2,建筑物均为石混结构。仓库内储存
锅炉蒸汽管路冲洗吹洗的对象包括()。
颜真卿“守其正,全其节”的气节备受后世________,人见其书,往往________他的人品。欧阳修称“其字画刚劲独立,不袭前迹,挺然奇伟,有似其为人”,即使对其楷书有些________的米芾,也感到颜体具有一种“昂然不可犯之色”。填入画横线部分最恰当的
下列关于获得性上颌骨缺损修复治疗的叙述,正确的是()。
以下表达式与Int(3.5)的值相同的是
Manypartsoftheworldarelosingimportantnaturalresources,suchasforests,animals,orcleanwater.Chooseoneresourcethat
【B1】【B10】
最新回复
(
0
)