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
127
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. ’
32. When the levels of cortisol go higher, the hippocampus in the brain may
选项
A、become larger.
B、become smaller.
C、disappear completely.
D、be totally damaged.
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/ZSmd777K
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
Youwillhearfivepeopletalkingabout"HowtoSlowDownthePaceofLife".Forquestions9-13,choosefromthelistA~Fw
Youwillhearfivepeopletalkingabout"WhetherTheyWriteforThemselvesorforTheirReaders".Forquestions9~13,choos
DEALINGWITHWASTEPLASTICEveryyearpeoplethrowawaymillionsoftonnesofplasticbottles,boxesandwrapping.Thesecr
DEALINGWITHWASTEPLASTICEveryyearpeoplethrowawaymillionsoftonnesofplasticbottles,boxesandwrapping.Thesecr
DEALINGWITHWASTEPLASTICEveryyearpeoplethrowawaymillionsoftonnesofplasticbottles,boxesandwrapping.Thesecr
DEALINGWITHWASTEPLASTICEveryyearpeoplethrowawaymillionsoftonnesofplasticbottles,boxesandwrapping.Thesecr
DEALINGWITHWASTEPLASTICEveryyearpeoplethrowawaymillionsoftonnesofplasticbottles,boxesandwrapping.Thesecr
THOMASEDISONOnthenightof21October1931,millionsofAmericanstookpartinacoast-to-coastceremonytocommemorate
WILLIAMTHEHERO!BraveWilliamBaldock,whoissixyearsold,isaheroafterhelpinghismotherwhenshefelldownstairs
随机试题
37岁女性患者,反复水肿1年,临床诊断为慢性肾小球肾炎,血压180/105mmHg,尿蛋白(+),红细胞(++),血肌酐:102μmol/L。血红蛋白105g/L。除饮食疗法外,目前该患者最主要的治疗措施应是
正常支气管呼吸音的听诊部位在
麦门冬汤原方中麦冬与半夏的配伍比例是()竹叶石膏汤原方中麦冬与半夏的配伍比例是()
患者,女性,40岁。由家人背送至急诊,家属诉半小时前发现其不省人事,倒卧在家中床上,时有呕吐。查体:皮肤多汗,流涎,双侧瞳孔明显缩小,呼吸有大蒜味,分诊护士首先考虑该患者最有可能为
某宗房地产购买总价为50万元,首付款为房价的30%,余款由银行贷款支付,该贷款的期限为10年,年利率为5.58%,按月等额偿还本息。则关于该房地产价格的说法中,正确的有()。
下列不符合中型电影院建筑基地条件的是()。
教学设计需要遵循的原则有系统性原则、程序性原则、()原则、反馈性原则.
就业歧视,是指用人单位没有合法依据,对未来潜在的就业人员自行作出各种限制性条款,从而排除了本该符合相关职位人员的平等就业权的一种现象。根据上述定义,下列属于就业歧视的是()
已知α1=[1,2,一3,1]T,α2=[5,一5,a,11]T,α3=[1,一3,6,3]T,α4=[2,一1,3,a]T.问:a为何值时,向量组α1,α2,α3,α4线性无关;
Indiatoppedalistofcountriesinitshopefulnessaboutretirement,accordingtoarecentreportbyHSBCofpeople’sexpectat
最新回复
(
0
)