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
Every living thing has an inner biological clock that controls behavior. The clock works all the time even when there are no out
Every living thing has an inner biological clock that controls behavior. The clock works all the time even when there are no out
admin
2013-11-29
21
问题
Every living thing has an inner biological clock that controls behavior. The clock works all the time even when there are no outside signs to mark the passing of time. The biological clock tells plants when to form flowers and when the flowers should open. It tells insects when to leave the protective cocoon and fly away. And it tells animals when to eat, sleep and wake. It controls body temperature, the release of some hormones and even dreams. These natural daily events are circadian rhythms.
Man has known about them for thousands of years. But the first scientific observation of circadian rhythms was not made until 1729. In that year French astronomer, Jean-Jacques d’Ortous de Mairan, noted that one of his plants opened its leaves at the same time every morning, and closed them at the same time every night. The plant did this even when he kept it in a dark place all the time. Later scientists wondered about circadian rhythms in humans. They learned that man’s biological clock actually keeps time with a day of a little less than 25 hours instead of the 24 hours on a man-made clock. About four years ago an American doctor, Eliot Weitzman, established a laboratory to study how our biological clock works. The people in his experiments are shut off from the outside world. They are free to listen to and live by their circadian rhythms. Dr. Weitzman hopes his research will lead to effective treatments for common sleep problems and sleep disorders caused by aging and mental illness. The laboratory is in the Monteflore Hospital in New York City. It has two living areas with three small rooms in each. The windows are covered, so no sunlight or moonlight comes in. There are no radios or television receivers. There is a control room between the living areas. It contains computers, one-way cameras and other electronic devices for observing the person in the living area. The instruments measure heartbeat, body temperature, hormones in the blood, other substances in the urine and brain waves during sleep. A doctor or medical technician is on duty in the control room 24 hours a day during an experiment They do not work the same time each day and are not permitted to wear watches, so the person in the laboratory has no idea what time it is. In the first four years of research, Dr Weitzman and his assistant have observed 16 men between the ages of 21 and 80. The men remained in the laboratory for as long as six months. Last month, a science reporter for The New York Times newspaper, Dava Sobol, became the first woman to take part in the experiment. She entered the laboratory on June 13th and stayed for 25 days. Miss Sobol wrote reports about the experiment during that time, which were published in the newspaper.
What is Mr. Weitzman’s ultimate purpose of establishing a laboratory?
选项
A、He wanted to have his experiment report published in the newspapers
B、People are free to listen to and live by their circadian rhythms
C、He wanted to find a way to treat people’s diseases
D、He could gain some reputation for the first scientific observation of circadian
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/UjhO777K
0
考博英语
相关试题推荐
Forlaymenethnologyisprobablythemostinterestingofthebiologicalsciencesfortheveryreasonthatitconcernsanimalsin
Oneofthemajordifferencesbetweenmanandhisclosestlivingrelativeis,ofcourse,thatthechimpanzeehasnotdevelopedth
Oneofthemajordifferencesbetweenmanandhisclosestlivingrelativeis,ofcourse,thatthechimpanzeehasnotdevelopedth
Oneofthemajordifferencesbetweenmanandhisclosestlivingrelativeis,ofcourse,thatthechimpanzeehasnotdevelopedth
Oneofthemajordifferencesbetweenmanandhisclosestlivingrelativeis,ofcourse,thatthechimpanzeehasnotdevelopedth
AndresearcherssaythatlikethoseliteraryromanticsRomeoandJuliet,theymaybeblindtotheconsequencesoftheirquestsf
AndresearcherssaythatlikethoseliteraryromanticsRomeoandJuliet,theymaybeblindtotheconsequencesoftheirquestsf
Sincethecouplecouldnot______theirdifferences,theydecidedtogetadivorce.
随机试题
改善过滤效果的关键是什么?
腹膜炎患者采用半卧位,其目的包括()。
一胎龄34周的新生儿,体温34℃,腋肛温差为正值,恢复正常体温的时间最好是( )。
城镇中发现甲类传染病和乙类传染病中的艾滋病、肺炭疽病的病人、病原携带者和疑似病人时,国家规定的报告时间是
患者,男,50岁。左下6缺失,设计双端固定桥时,对于固定连接体的要求正确的是
根据预算法律制度的规定,下列各项中,属于一般公共预算收入的有()。
英文字母A是中心对称图形.()
中国是一个农业社会,聚族而居、_______在农业大环境下,成了传统家庭的重心,由此而衍生出来的道德价值观,首先是儒家倡导的“亲亲”,形成长幼有序、孝悌仁爱的道德观念,并用家庭成员_______和继承下来的风俗习惯,有效地维护血缘秩序,履行个人在血缘等级关
①追求成熟,已经成为当今社会的一种_____________,尤其是涉世不深的年轻人,更想以老到、___________的面孔引起别人对自己的注意和重视。②事物的发展一旦停滞___________趋于保守,就将走向灭亡,___________为新生事物所取
Forsomeemployers,thepolicyoflifelongemploymentisparticularlyimportantbecauseitmeansthattheycanputmoremoneyand
最新回复
(
0
)