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
According to the experiments, many blind people
According to the experiments, many blind people
admin
2014-03-21
91
问题
According to the experiments, many blind people
Did you ever wonder why it is that most people are "programmed" to sleep at night instead of during the day? If there’s something about the cycle of light and dark that’s telling us when to sleep, then shouldn’t the sleep cycle of a blind person be different? (14) It turns out that many blind people do have the same sleep cycle as sighted people. How can this happen? The answer is; hormones—one hormone called melatonin in particular. (15) In sighted people, the level of melatonin goes up at night or when it’s dark and goes down in the day or when it’s light-It’s believed that it’s the presence of this hormone in the blood that gives us the urge to sleep. If an increase in melatonin level "programs" sighted people to sleep at night, then what about blind people? A researcher named Dr. Charles Czeisler tells about an interesting experiment. He tried shining a bright light into the eyes of some blind people. (16) When he did this, he noticed that the level of the melatonin in the blood of these subjects went down—just as it would do for sighted people. Somehow, the eyes of these subjects, even though they were damaged and had no visual perception of light, could tell their brain when there was more or less light. However, this doesn’t work for all blind people. Further research may be able to explain this sensitivity to light in terms of the type of blindness of the subject.
选项
A、A decrease in melatonin level.
B、An increase in melatonin level.
C、Personal habits.
D、Psychological hint.
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/jkUK777K
0
专业英语四级
相关试题推荐
Whatisthewoman’sprojectmainlyabout?
Whatisthewoman’sprojectmainlyabout?
Manypeoplebelievethatsciencehelpssocietytoprogressthrough______.Whatistheauthor’sattitudetowardsthetopic?
Manypeoplebelievethatsciencehelpssocietytoprogressthrough______.WhichofthefollowingstatementsisINCORRECTabout
Accordingtothespeaker,whatisStowe’sbestwritingabout?
ParcelExpressneedsthefollowingdetailsabortthesenderEXCEPT______
Whatisthisnewsmainlyabout?
Whatisthelecturemainlyabout?
Whatistheconversationmainlyabout?
随机试题
苯二氮革类能增加GABA能神经的突触抑制作用。
金融衍生工具的特点不包括()
患者,女,50岁。低热、消瘦就诊。2个月体重下降5kg。X线胸片示左上肺5cm×7cm团块状阴影,中心可见一厚壁空洞,洞壁欠光滑,无液平,余未见异常。既往体健。血常规检查示白细胞12.3×109/L,血红蛋白90g/L,血小板230×109/L。尿常规红
患者,男,l6岁,左下后牙龋洞,无明显自发疼痛,食物嵌入时疼。检查:左下6面龋坏,软化牙本质较多,叩(一),冷试敏感,电活力正常。去除无基釉后去腐敏感.不能全部去净该牙的初诊治疗是
诊断心肌坏死最特异和敏感的首选标志物是
某中学在学期末开展对学生的综合素质评价工作,不仅提前公布了评价的内容、标准、方法、程序以及相关评价人员和制度,设置了教师、学生、家长等多种人员参与的评价体系,还建立了相应的学生申诉制度。其最终目的是确保评价工作的()
将5个大小相同的正方形按右图的方式叠放,两个正方形重叠的位置刚好为边的中点。如果正方形的边长为8厘米,则这个组合图形的外周(下图粗线条)长度为()。
下列说法错误的是
______allthereferencestoverifytheinformation.
Whenreturningproductstous,youmusttakecaretoseethattheyarereceivedbyusandnotdamagedintransit.
最新回复
(
0
)