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
Spending 50 minutes with a cell phone close to your ear is enough to change brain cell activity in the part of the brain closest
Spending 50 minutes with a cell phone close to your ear is enough to change brain cell activity in the part of the brain closest
admin
2015-11-16
54
问题
Spending 50 minutes with a cell phone close to your ear is enough to change brain cell activity in the part of the brain closest to the antenna(天线). But whether that causes any harm is not clear, scientists at the National Institute of Health said at a conference last month, adding that the study will not likely settle concerns of a link between cell phones and brain cancer. "What we showed is glucose(葡萄糖)metabolism(代谢)(a sign of brain activity)increases in the brain in people who were exposed to a cell phone in the area closest to the antenna," said Dr. Nora Volkow of the NIH, whose study was published in the Journal of the American Medical Association. The study was meant to examine how the brain reacts to electromagnetic fields caused by wireless phone signals.
Volkow said she was surprised that the weak electromagnetic radiation(电磁辐射)from cell phones could affect brain activity, but she said the findings do not shed any light on whether cell phones cause cancer. "This study does not in any way indicate that. What the study does is to show the human brain is sensitive to electromagnetic radiation from cell phone exposures. " Use of the devices has increased dramatically since they were introduced in the early 1955 s, with about 5 billion cell phones now in use worldwide.
Some studies have linked cell phone exposure to an increased risk of brain cancers, but a large study by the World Health Organization did not offer a clear answer to this. Volkow’ s team studied 47 people who had their brain examined while a cell phone was turned on for 50 minutes and another while the phone was turned off. While there was no complete change in brain metabolism, they found a 7 percent increase in brain metabolism in the region closest to the cell phone antenna when the phone was on.
Experts said the results were interesting, but urged that they be understood with great care. " Although the biological significance, if any, of increased glucose metabolism from too much cell phone exposure is unknown, the results require further investigation," Henry Lai of the University of Washington in the U. S. and Dr. Lennart Hardell of University Hospital in Sweden, wrote in an article in JAMA. "Much has to be done to further investigate and understand these effects. " They wrote.
Doctor Volkow was astonished because______.
选项
A、her research has shed light on her understanding of cell phone
B、she found that cell phone exposure is harmful to human brain
C、she found that using a cell phone for about 50 minutes could influence or change brain activity
D、human brain is not responsive to electromagnetic radiation
答案
C
解析
事实细节题。根据第二段第一句话,即沃尔考说,手机发出的弱电磁辐射可能会影响大脑的活动,她对此很惊讶…。故选C。
转载请注明原文地址:https://kaotiyun.com/show/LURO777K
0
成人本科学位英语
相关试题推荐
Musiccomesinmanyforms;mostcountrieshaveastyleoftheirown.(56)themmofthecenturywhenjazzwasborn,Americahad
Musiccomesinmanyforms;mostcountrieshaveastyleoftheirown.(56)themmofthecenturywhenjazzwasborn,Americahad
Manyyearsago,whenIwasfreshoutofschoolandworkinginDenver,Iwasdrivingtomyparents’homeinMissouriforChristma
IreturnedtoAbuja,thecapitalofNigeria,aftercollegegraduation.Ihadbeentherebeforemymotherbecameaminister.
Parentsshouldstopblamingthemselvesbecausethere’snotalottheycandoaboutit.Imeantheteenager(十几岁的孩子)problem.Wha
I(enjoy)eating(in)goodrestaurants(and)(togoto)thetheaterafterwards.
Asweknow,physics______thescienceofenergy.
Toooftenyoungpeoplegetthemselvesemployedquitebyaccident,notknowingwhatliesinthewayofopportunityforpromotion,
Hedidn’tfearnewideas,________thefuture.
Itissaidthathe______amurder.
随机试题
除了使用按钮进行软件的退出之外,还有其他3种方法同样可以将软件关闭,分别是___________、___________、___________。
口呼吸的原因为
某病人皮肤黏膜均有散在性小红点,不高出皮肤表面,直径约1~2mm,加压时不褪色,称之为()。
A、在细胞培养中使细胞融合形成多核巨细胞B、细胞培养出现空斑C、在培养细胞胞质内形成嗜酸性包涵体D、培养细胞变肿大E、细胞培养不出现细胞病变乙型肝炎病毒
A、雌二醇B、壬苯醇醚栓C、甲羟孕酮D、司坦唑醇E、复方左炔诺孕酮片属于雌激素的是
最低结算备付金限额计算公式为()。
根据下面材料,回答问题。金属历来都是通过采矿、冶金制取的,可是80年代初期,科学家发现在聚乙炔中加入强氧化剂或还原剂后,它的导电性能大大提高。因为这种塑料具有金属的一般特性,所以人们称它为“人造金属”。近年来,它的发展极为神速,人们又先后研制成功
“控制话题”属于()上的阻抗。
下列属于声卡中主音频处理芯片功能的是______。 Ⅰ) 实现三维音效处理的运算和加速 Ⅱ) MIDI波表合成引擎 Ⅲ) 完成数字声音的编码、解码和编辑操作 Ⅳ) 放大声音信号
Thisisoneofthebooksthat______onthissubject.
最新回复
(
0
)