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
82
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
BOOKORDERFORMCustomer’sname:JaneUsherDaytimephonenumber:51.________Nameofbook:52
ThereisnojettrafficatWashington’sNationalAirportfrom11pmto7ambecause______.Theauthorofthepassageinconcerne
Bothprincesgaveupearthlywealthandpowerforthespirituallife.
Poorchildrenshouldnotbedeprivedoftheopportunitytoparticipateinsportswheneverpossible.
AWhattheFCTCDemandsBUSSigningoftheFCTCCOppositiontotheFCTCDHowtheFCTCCameintoBeingEWhattheFCTCWi
UnderstandingAutismAutism(孤独症)isalife-longdevelopmentaldisabilitythatpreventsindividualsfromproperlyunderstandi
UnderstandingAutism1.Autism(孤独症)isalife-longdevelopmentaldisabilitythatpreventsindividualsfromproperlyunderstan
NewChangesinAmericanLifeOnceitwaspossibletodefinemaleandfemaleroleseasilybythedivisionoflabor.Menworke
Naturalselectiondescribesthebiologicalprocessinwhichthedifferencesofindividualswithinapopulationinfluencestheir
StanfordUniversity1StanfordUniversity,famousasoneofnorthernCalifornia’sseveralinstitutionsofhigherlearning,isso
随机试题
王子猷居山阴,夜大雪,眠觉,开室,命酌酒。四望皎然。因起彷徨,咏左思《招隐诗》。忽忆戴安道,时戴在剡,即便夜乘小舟就之。经宿方至,造门不前而返。人问其故,王曰:“吾本乘兴而行,兴尽而返,何必见戴!”解释下列加点词语的意思。四望皎然即便夜乘小舟就之
A.温度计制造B.造纸C.氮肥工业D.苦味酸E.有机磷农药生产氯的接触机会是
下列各项中不属于医疗事故的是
女性,60岁,有高血压病史,突然出现双下肢无力倒地,随即自行站起,整个过程中意识清楚,并出现眩晕、恶心,不伴耳鸣,持续数分钟后恢复,诊断考虑()
政府集中采购目录和采购限额标准由()确定并公布。
以下可以进行期转现的情况有()。
结合实际阐述学校教育应如何与家庭教育、社会教育相互协调、相互配合。
教数学的王老师为了让学生每天都学习数学,经常搞突然袭击,不提前通知、不定期地进行数学测验,这与桑代克提出的哪一教学定律相违背()
元朝的“烧埋银”类似于现代的( )。
如果运行一个表单,下列事件首先被触发的是
最新回复
(
0
)