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
2025-02-21
8
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 of the passage is primarily concerned with
选项
A、promoting mammalian sleep research
B、documenting the importance of non-REM sleep in hormone regulation
C、describing the role of sleep in human behavior and development
D、arguing that humans need more sleep to function optimally
E、illustrating the importance of REM sleep to brain function
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3967028.html
相关试题推荐
Allmammalsrequiresleep;itisanessentialpartoflife.Forgiraffes,
Allmammalsrequiresleep;itisanessentialpartoflife.Forgiraffes,
Anessentialpurposeofthecriminaljusticesystemistoenablepurgationtota
Althoughitisalmostalwaystakenforgranted,sleepisanessentialpartofmo
Theevolutionofintelligenceamongearlylargemammalsofthegrasslandswasdu
Femalelaborwasessentialtothegrowthofeighteenth-centuryEuropeantextile
Essentiallyabluesartist,RobertCrayplaysmusicinfluencedbyprogressivero
ForAlbertEinstein,theunvaryingspeedoflightwasa______,anessentialpres
Onerequirementoftimelessartisthatitdeepenand______ourawareness,notth
Nothingintheessayis______:everysentencecontributesinanessentialwayto
随机试题
Themanagersummonsallthestaffatonce,forthereis________________(很重要的议题要
如果仔细观察的话,会有所发现的。Ifyouobservecarefully,youwillfindsomething.译文增译主语you,以便更好地
IstartfrommyhomeinthequietlittlesuburbofForestHills,LongIsland
[originaltext]M:Hi,MrsDupree.Youaskedmetocomeby?W:Oh,yes.Clinton.
老张是一个有二十多年烟龄的老烟民,尽管之前多次尝试戒烟,但是都没有成功。最近在单
A
A.腰大肌试验阳性 B.先腹痛后发热 C.先发热后腹痛 D.右下腹固定性压
(2017年)在信用风险客户评级中,违约概率的估计包括()。 Ⅰ某一信用等级
人们对劳工问题的认识和解决,可以减轻它的危害程度,却不能彻底消灭它,体现了劳工问
主张留美教育的倡议者是( )A.曾国藩 B.李鸿章 C.容闳 D.丁汝昌
最新回复
(
0
)