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
18
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://tihaiku.com/zcyy/3967031.html
相关试题推荐
Allmammalsrequiresleep;itisanessentialpartoflife.Forgiraffes,
Allmammalsrequiresleep;itisanessentialpartoflife.Forgiraffes,
Thereisanessential______inhumangestures,andwhensomeoneraisesthepalm
Anessentialpurposeofthecriminaljusticesystemistoenablepurgationtota
Althoughitisalmostalwaystakenforgranted,sleepisanessentialpartofmo
Althoughitisalmostalwaystakenforgranted,sleepisanessentialpartofmo
Theevolutionofintelligenceamongearlylargemammalsofthegrasslandswasdu
Theevolutionofintelligenceamongearlylargemammalsofthegrasslandswasdu
Essentiallyabluesartist,RobertCrayplaysmusicinfluencedbyprogressivero
Becausehernewjobrequireddailyattendance,Joanwasobligedto(i)______her
随机试题
Americanwomenexperienceagreat【1】oflifestyles.A"typical"Americanwoma
Tomwasawanderer.Whenhiswife,Elsie,cametovisithimatacareunitf
RisingInequalityIsHoldingBacktheU.S.Economy[A]Inannoun
某项目部组织开展特种作业人员安全教育培训,涉及的培训内容有特种作业人员管理规定、
A公司在融资前,创始股东持有该公司100%股权,持股数量为10000股;股权投资
孕妇,40岁。第一胎为先天愚型,核型分析母方为D/G平衡易位携带者,父亲正常。第
计入商品采购成本的相关税费包括()。 A.进口关税 B.消费税
女,26岁。2周前因楔状缺损引起可复性牙髓炎来院做间接盖髓术,术后已无症状,这次
某固定资产原价50000元,预计净残值500元,使用年限5年,采用双倍余额递减法
根据《企业会计准则第15号--建造合同》,工程成本中的其他直接费包括施工过程中发
最新回复
(
0
)