首页
登录
职称英语
Every living thing has an inner biological clock that controls behavior. The
Every living thing has an inner biological clock that controls behavior. The
游客
2025-04-16
5
管理
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. [br] In the experiment conducted by Mr. Weitzman, the doctor who is on duty does not work the same time each day ______.
选项
A、in order to observe the abnormal behavior of the people at different times
B、so as not to be recognized by the people
C、so as to avoid indicating to the people what time it is when he starts work
D、so as to leave the people’s circadian rhythms in disorder
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/4039937.html
相关试题推荐
EveryyearNewZealanderslivinginLondoncanbeseenloadingupKombivans
Inapurelybiologicalsense,fearbeginswiththebody’ssystemforreactin
Inapurelybiologicalsense,fearbeginswiththebody’ssystemforreactin
Everylivingthinghasaninnerbiologicalclockthatcontrolsbehavior.The
Everylivingthinghasaninnerbiologicalclockthatcontrolsbehavior.The
Everylivingthinghasaninnerbiologicalclockthatcontrolsbehavior.The
Itcomesasnosurprisethatsocietieshavecodesofbehavior.Thecharacterof
______lastyearandisnowearninghislivingasanadvertisingagent.(北京大学2007年
Theovercrowdedlivingconditions______aheavystrainonthefamily.(四川大学2009年试题
Jimmyearnshislivingby______worksofartinthemuseum.(中南大学2007年试题)A、renewin
随机试题
MotorolaInc.,theworld’ssecond-largestmobilephonemaker,willbegins
Itwasin1912thattheoilshipsankwhile(cross)______theAtlanticOcean.cr
Askingstudentstopaymorefortheireducationwassupposedtoencourageco
InthearticletheauthorimpliesthatlittlechildreninAmericausedtostay.
Cultureisthesumtotalofallthetraditions,customs,beliefs,andwayso
肝脏格利森鞘膜内的主要管道有A.门静脉、肝静脉、肝胆管 B.肝动脉、门静脉、静
某企业批量生产一种零件,投产批量为20件,经过4道工序加工,按照加工顺序,单件每
下列关于操作风险的说法,错误的是()。A.操作风险可分为人员因素、内部流程
会计工作的政府监督部门包括( )。 A.财政部门B.税务部门C.会
根据《环境噪声污染防治法》,产生环境噪声污染的企业事业单位在拆除或者闲置环境噪声
最新回复
(
0
)