首页
登录
职称英语
Sleep is part of a person’ s daily activity cycle. There are several differe
Sleep is part of a person’ s daily activity cycle. There are several differe
游客
2024-02-19
24
管理
问题
Sleep is part of a person’ s daily activity cycle. There are several different stages of sleep, and they too occur in cycles. If you are an average sleeper, your sleep cycle is as follows. When you first drift off into slumber (安睡) , your eyes will roll about a bit, your temperature will drop slightly, your muscles will relax, and your breathing were slow and become quite regular. Your brain waves slow down a bit too, with the alpha rhythm of rather fast waves predominating for the first few minutes. This is called stage 1 sleep. For the next half hour or so, as you relax more and more, you will drift down through stage 2 and stage 3 sleep. The lower your stage of sleep, the slower your brain waves will be. Then about 40 to 60 minutes ’after you lose consciousness you will have reached the deepest sleep of all. Your brain waves will show the large slow waves that are known as the delta rhythm. This is stage 4 sleep.
You do not remain at this deep fourth stage all night long, hut instead about 80 minutes after you fall into slumber, your brain activity level will increase again slightly. The delta rhythm will disappear, to be replaced by the activity pattern of brain waves. Your eyes will begin to dart around under your closed eyelids (眼皮) as if you were looking at something occurring in front of you. This period of rapid eye movement lasts for some 8 to 15 minutes and is called REM sleep. It is during REM sleep period, your body will soon relax again, your breathing will grow slow and regular once more, and you will slip gently back from stage 1 to stage 4 sleep -- only to rise once again to the surface of near consciousness some 80 minutes later. [br] One of the features of REM sleep is that______.
选项
A、there are large slow waves, though rapid for the first few minutes
B、you have the deepest sleep
C、there are no brain waves
D、the brain waves are a little last and the brain becomes a little active
答案
D
解析
从第二段第一、二句可知大脑运动水平会再度略有提高,而delta波消失,取代的是脑电波运动图形。据此可知脑电波变得快了一点,大脑活跃些。而大的缓波和睡得最深是stage 4 sleep的特征,rapid for the first few minutes 是 stage 1 sleep的特征,整个睡眠阶段都是有脑电波的,故A,B和C皆错。
转载请注明原文地址:https://tihaiku.com/zcyy/3464145.html
相关试题推荐
PopulationGrowthinDifferentNationsMorethan6,500mil
PopulationGrowthinDifferentNationsMorethan6,500mil
PopulationGrowthinDifferentNationsMorethan6,500mil
PopulationGrowthinDifferentNationsMorethan6,500mil
PopulationGrowthinDifferentNationsMorethan6,500mil
[originaltext]Manyofusbelievethataperson’smindbecomeslessactivea
[originaltext]Areyoutiredofyourjobandwanttodosomethingdifferent
A、Toattractpeoplewithdifferentinterests.B、Tochargeadditionalservicefee
Heisaveryeasy-goingperson,______(从结识新交中得到许多乐趣).whoderivesalotofpleas
Individualswillbe______fortheirownpersonaldevelopmentplanswhichwillb
随机试题
TheJointStatementontheFrameworkforCooperationstipulatesthatboththepa
PeoplewhospendalotoftimesurfingtheInternetaremorelikelytoshow
Whatisthepurposeofthefirstparagraph?[br]WhatisnottheroleofFIFA?A、
某市的一个小区里住了很多该市的消防员家属。一个星期前,在一次处理该市的一处工厂爆
初产妇,26岁,妊娠31周,自觉头晕、乏力及食欲不良半个月余。胎位、胎心及骨盆外
可以极为接近被摄体进行聚焦,在胶片上形成的影像可与被摄体自身的真实大小相当,又被
(2017年真题)下列选项中,属于股权投资基金特点的是()。A.投资期限短
国际工程投标中,投标人做出最终报价前应对估算人员算出的暂时标价进行对比分析,其目
汽车消费信贷计划的程序不包括()。A:申请贷款 B:草签协议 C:签订合同
肝硬化患者出现持续性白细胞减少,与哪个选项关系最大A.脾功能亢进 B.营养吸收
最新回复
(
0
)