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
118
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
AGOODSTARTTOAHOLIDAYIhadneverbeentoDenmarkbefore,sowhenIsetouttocatchtheferryinearlyMay,Ilittle【
AGOODSTARTTOAHOLIDAYIhadneverbeentoDenmarkbefore,sowhenIsetouttocatchtheferryinearlyMay,Ilittle【
ClarethinkstheirfatherwillbepleasedbyTom’snews.Tombelieveshecanmanagebothswimmingandschoolwork.
Whattimedothephotographyclassesbegin?Philip’shappywiththecoursebecausehe’s
Tomakechips,youcutuppotatoes,puttheminoilanddothis.f.______
WhichofthefollowingstatementsisNOTtrue,accordingtothepassage?Whatdoesthecustomercollectbeforeheorsheleaves
HighwaysintheUSTheUnitedStatesiswell-knownforitsnetworkofmajorhighwaysdesignedtohelpadrivergetfromonep
Accordingtothefirstparagraph,whichofthefollowingisNOTaproblemofaging?Theexpression"iftheycanaffordtoretir
Theytriedtheirbesttoresolvetheresidualproblems.
LeukemiaLeukemiaisthemostcommontypeofcancerkidsget,butitisstillveryrare.Leukemiainvolvesthebloodandblo
随机试题
级数的收敛域为_____.
A.中性B.远中C.近中D.正中E.前伸正中时上颌第一磨牙近中颊尖咬在下颌第一磨牙颊沟的远中为
女性50岁,低热乏力两年,近五月来,四肢关节肌肉酸痛,上楼困难,同时在眼睑及面颊部出现红色皮疹,吞咽困难。体检:眼睑周围水肿,眼睑面颊、远端指间关节及甲根皱襞有暗紫红色斑。
A.下颌后牙颊尖舌斜面从中央窝沼上后牙舌尖颊斜面向舌侧继续滑行,约到一半处分离B.下颁后牙舌尖颊斜面沿上后牙广尖舌斜面向舌侧继续滑行,约到一半处分离C.工作侧上下颌后牙的同名尖彼此相对D.由正中牙合向上,向前,向上至对刃E.由对刃滑行回归至正中颌
经脉属金,腧穴也属金的穴位是
在采取自营方式建造固定资产时,下列说法正确的有()。
①什么书在什么时候再去读再去翻,连我自己也无把握,完全要看一个时期一个时期的兴趣②关于这事,我常自比为古时的皇帝,而把插在架上的书譬诸列屋而居的宫女③知道某册书是何种性质,其中大概有些什么可取的材料而已④除小说外,我少有全体读完的大部的书,只凭了购入
学生在学习正方形、长方形、三角形时已形成了轴对称图形概念,在学习圆时,学生立即就能发现圆具有轴对称图形的一切特征,从而得出“圆也是轴对称图形”的结论。这一学习属于()。
Singapore1.Singaporeisanindependentcity-stateinsoutheasternAsia,consistingofonemajorislandtheSingaporeIsland--an
Howlonghavetheynotmeteachother?
最新回复
(
0
)