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
2012-07-29
72
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 Landfield 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. "
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
根据文章第一段最后一句可知大脑海马区(hippocampus)是控制人记忆与学习的关键部分,故选D。
转载请注明原文地址:https://kaotiyun.com/show/Cdmd777K
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
Lindawantstochangeacassettebecauseshedislikesit.Lindaishappywithhercassetteplayer.
HighwaysintheUSTheUnitedStatesiswell-knownforitsnetworkofmajorhighwaysdesignedtohelpadrivergetfromonep
Academicrecordsfromotherinstitutionsoftenbecomepartofauniversity’sofficialfileandcanneitherbereturnedtoastud
"Othercountrieshaveaclimate;inEnglandwehaveweather".Thisstatementsuggeststhat______.Theword"lands"inthelast
AIntroductiontoSingaporeBEducationCEconomyDStateSystemofSingaporeEHistoryofSingaporeFLandandClimate
WhoisNOTalikelycandidateforthisyear’sNobelPrizeinmedicine?WhichwasNOToriginallyoneoftheNobelPrizes?
Hetoldmehehadbeenofferedaverywell-paidpositionabroad.
NaturalMedicineSinceearliestdays,humanshaveusedsomekindsofmedicines.Weknowthisbecausehumanshavesurvived.Ancie
PassiveSmokingisWorkplaceKillerPressuremountedonBritainonMondaytotakeactionon(1)smokingwithnewresearchshowing
EngineeringEthicsEngineeringethicsisattractingincreasinginterestinengineeringuniversitiesthroughoutthenation,a
随机试题
官渡之战和赤壁之战的相同点有()。①东汉末年的军阀割据混战②以少胜多的战役③都是以曹操胜利而结束
It’snecessary______thedictionaryimmediately.
关于糖尿病运动治疗的说法正确的是()
门静脉高压形成后,主要的病理改变可有()。
一个病人腹痛已5天,如果怀疑急性胰腺炎,最有诊断意义的指标是()。
某施工单位承接了某项工程的总包施工任务,该工程由A、B、C、D四项工作组成,施工场地狭小。为了进行成本控制,项目经理部对各项工作进行了分析,其结果见下表:工程进展到第25周5层结构时,公司各职能部门联合对该项目进行突击综合大检查。 检查成本时发现:
在俄亥俄模式中,工作管理和关心人得分高的领导比其他类型的领导更能促使员工有()。
《农桑辑要》是明朝司农司撰写的一部农业科学著作。()
窃读记林海音①转过街角,看见饭店招牌,闻见炒菜的香味,听见锅勺敲打的声音,我松了一口气,放慢了脚步。下课从学校急急赶到这里,身上已经汗涔涔的,总算到达目的地——不是三阳春,而是紧
information
最新回复
(
0
)