首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Late-Night Drinking Coffee lovers beware. Having a quick" pick-me-up" cup of coffee late in the day will play havoc with you
Late-Night Drinking Coffee lovers beware. Having a quick" pick-me-up" cup of coffee late in the day will play havoc with you
admin
2016-07-17
21
问题
Late-Night Drinking
Coffee lovers beware. Having a quick" pick-me-up" cup of coffee late in the day will play havoc with your sleep. As well as being a stimulant, caffeine interrupts the flow of melatonin, the brain hormone that sends people into a sleep.
Melatonin levels normally start to rise about two hours before bedtime. Levels then peak between 2 am and 4 am, before falling again. "It’s the neurohormone that controls our sleep tells our body when to sleep and when to wake, " says Maurice Ohayon of the Stanford Sleep Epidemiology Research Center at Stanford University in California. But researchers in Israel have found that caf-feinated coffee halves the body’s levels of this sleep hormone.
Lotan Shilo and a team at the Sapir Medical Center in Tel Aviv University found that six volunteers slept less well after a cup of caffeinated coffee than after drinking the same amount of decaf. On average, subjects slept 336 minutes per night after drinking caffeinated coffee, compared with 415 minutes after decaf. They also took half an hour to drop off—twice as long as usual—and jigged around in bed twice as much.
In the second phase of the experiment, the researchers woke the volunteers every three hours and asked them to give a urine sample. Shilo measured concentrations of a breakdown product of melatonin. The results suggest that melatonin concentrations in caffeine drinkers were half those in decaf drinkers. In a paper accepted for publication in Sleep Medicine, the researchers suggest that caffeine blocks production of the enzyme that drives melatonin production.
Because it can take many hours to eliminate caffeine from the body, Ohayon recommends that coffee lovers switch to decaf after lunch.
Which of the following tells us how caffeine affects sleep?
选项
A、Caffeine blocks production of the enzyme that stops melatonin production.
B、Caffeine interrupts the flow of the hormone that prevents people from sleeping.
C、Caffeine halves the body’s levels of sleep hormone.
D、Caffeine stays in the body for many hours.
答案
C
解析
第二段第三个句子谈到,“控制我们睡眠的是神经激素”,而这一段的最后一个句子告诉我们“含咖啡因咖啡能使这种激素减半”。这正是咖啡因影响睡眠的原因。
转载请注明原文地址:https://kaotiyun.com/show/oCQd777K
本试题收录于:
职称英语理工类C级题库职称英语分类
0
职称英语理工类C级
职称英语
相关试题推荐
Peoplewithchronicheadachesneverrealizethattheyneedtoseeadoctor.Theytendtobelievethattheywillnotbewelcomed
Weallknowtherearetimesthatkidsseemtocomplain(51)astomachachetogetoutofchoresorgoingtoschool.Don’tbeso
A.beunderpressureineverydaylifeB.feeltiredinreallifeC.beafraidoflosinghisjobsinreallifeD.feellonelyin
NoisePollutionPsychologistsnowbelievethatnoisehasaconsiderableeffectonpeople’sattitudesandbehavior.Experimen
Theiceisnotthickenoughtobeartheweightofatank.
Late-nightDrinkingCoffeeloversbeware.Havingaquick"pick-me-up"cupofcoffeellateinthedaywillplay-havocwithyo
Thenumberofprematurelystoppedclinicaltrialshasincreasedrecently.Thetrialswerestoppedearlybecausethetreatments
Johnhasmadeuphismindnottogotothemeeting.
Jackwasdismissed.
Jackwasdismissed.
随机试题
以下常用的高级程序设计语言中,用来开发UNIX内核的是___________。
下列关于中心性浆液性视网膜脉络膜病变的叙述中,错误的是
胞吐作用
根据《压力容器安全技术监察规程》对压力容器的分类,第三类压力容器里低温液体储存容器的容积()。
一般情况下,招标人在通过招标选择承包人时通常以()为依据。
市区某电信部门拥有房产原值1850万元(扣除率为30%),9月份将850万元的房屋出租,每月租金3.2万元,当月收取了半年的租金。9月提供电信服务取得收入140万元,其中包括随同出售的通信器材36.5万元。从事通信线路工程取得收入350万元,其中包括电缆、
我国《婚姻法》规定,禁止直系血亲和三代以内旁系血亲结婚。直系血亲是指和自己有直接血缘关系的亲属,三代以内旁系血亲是指与己身出自同一父母或同一祖父母、外祖父母,除直系血亲外的所有血亲。根据上述定义,下列选项中的甲和乙可以结婚的是()
被视为夺冠大热门的斗牛士竟然_________瑞士零封,最终0比1输掉比赛,这无疑给了野心勃勃要完成欧洲杯冠军再夺世界杯的斗牛士们重大_________。历史资料显示,首战输球的球队还没有夺冠的经历。第二场打洪都拉斯,西班牙除了获胜别无选择,这个小组的出线
在下列引起通货膨胀的诸因素中,()导致成本推进型通货膨胀。
In1957adoctorinSingaporenoticedthathospitalsweretreatinganunusualnumberofinfluenza-likecases.Influenzaissomet
最新回复
(
0
)