首页
登录
职称英语
All mammals require sleep; it is an essential part of life. For giraffes,
All mammals require sleep; it is an essential part of life. For giraffes,
游客
2024-01-11
51
管理
问题
All mammals require sleep; it is an essential part of life. For giraffes, two hours a
Line day is enough. For bats, that number is closer to twenty. The average adult human
needs between seven and nine hours of sleep every day. Despite these differences,
mammals all have one thing in common: If they do not get enough sleep, they can
(5) suffer serious mental and physical consequences.
The most extensive sleep research has been conducted on people. Through
these studies, scientists have identified two broad categories of sleep, which can
be further divided into five stages with distinct physiological functions. Taken
together, they form a complete sleep cycle. The first four stages are marked by a
(30) lack of rapid eye movement (REM). Therefore, they are referred to as non-REM
sleep. While people are engaged in non-REM sleep, several things are occurring.
Researchers have discovered that during this early sleep, the human body
releases a series of hormones responsible for the proper functioning of certain
body systems. Disrupted sleep can cause these hormones to fall out of balance.
(15) The results can contribute to disorders such as diabetes, depression, infertility,
or even cancer. Lack of sleep, especially in stages 3 and 4, can literally stunt the
growth of children and may increase rates of obesity in adults.
Stage 5 sleep is defined by the occurrence of rapid eye movement, otherwise
known as dreaming. Note that, while REM sleep is the final stage in a sleep cycle,
(20) a complete cycle generally lasts only about 95 minutes. A person will experience
four to six cycles in one sleep session, with REM sleep taking up a larger portion
of the cycle as the night continues. Scientists have advanced several theories
about why humans need REM sleep. One view is that dreaming aids in memory
consolidation. Under this theory, during REM sleep the brain not only strengthens
(25) memory of important actions or events, but it weakens memory of unimportant
things. Another view is that dreaming is necessary for proper central nervous
system development. Yet another theory suggests that REM sleep involves the
repair of monoamine receptors. The theories are not necessarily exclusive; in fact,
they all reach the conclusion that REM sleep deprivation can result in death. [br] The author’s argument is developed primarily by the use of
选项
A、an attack on poorly constructed sleep research studies
B、a critique of recent scientific studies on REM-sleep
C、a warning against getting too little sleep
D、an analogy between human and non-human sleep processes
E、an overview of specific processes that may occur during different stages of sleep in humans
答案
E
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/3352469.html
相关试题推荐
AuthoritiesinCaliforniarequireddriverstousetheirheadlightsonacertain
Althoughitisassumedthatpeacocks’magnificenttailsfunctionessentiallyto
SergeantOurpoliceacademynolongerrequiresitsapplicantstopassaphysical
Currentlegislationthatrequiresdesignatedsectionsforsmokersandnonsmokers
Theinterviewisanessentialpartofasuccessfulhiringprogrambecause,with
Theworld’sannualfoodproductionslightlyexceedstheamountoffoodrequired
Thefastestofmammals,cheetah’sbodiesaregearedtoacceleratefromonetofo
Lawmakersareexaminingmeasuresthatwouldrequirebankstodiscloseallfeesa
Unlikeatypicalautomobileloan,whichrequiresafifteentotwentypercentdow
Corporationswillsoonberequiredtoreporttothegovernmentwhethertheyhave
随机试题
Nogreatscientisteverwantshispupilstobemeregramophonerecordsfaithfull
______manmustfearwhentravelinginspaceisradiationfromthesun.A、WhichB、
Thehumanbrainhastwosides,andeachsidehasdifferentworktodo.T
A
某工程现场φ25mmHRB400钢筋的焊接采用闪光对焊方式,检测结果见右表。请你
Thechangeinthatvillagewasmiraculou
关于单纯疱疹病毒,正确的是A.血液传播B.自然宿主是人C.可导致先天性感染D.引
投资者将期货作为资产配置的组成部分,借助期货能够()。A.为其他资产进行风险对
《药品经营管理规范》对零售企业陈列的要求有A.药品与非药品分区陈列,并有明显隔离
常见的心理咨询的手段不包括A.宣泄 B.领悟 C.挖掘幼年体验 D.增强自
最新回复
(
0
)