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, be careful. Having a quick "pick-me-up" cup of coffee late in the day will interrupt your
Late-night Drinking Coffee lovers, be careful. Having a quick "pick-me-up" cup of coffee late in the day will interrupt your
admin
2013-06-25
47
问题
Late-night Drinking
Coffee lovers, be careful. Having a quick "pick-me-up" cup of coffee late in the day will interrupt your sleep. As well as being a stimulant(兴奋剂), caffeine interrupts the flow of melatonin(褪黑激素), 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(神经激素)that controls our sleep and 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 caffeinated 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(脱咖啡因咖啡). 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.
In the second phase of the experiment, the researchers woke the volunteers every three hours and asked them to give a urine(尿)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(酶)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.
The experiment mentioned in paragraph 4 finds that caffeine drinkers
选项
A、produce less melatonin.
B、sleep longer than decaf drinkers.
C、produce more urine at night.
D、wake up every three hours.
答案
A
解析
题意:第四段提到的实验发现,咖啡因摄入者产生的褪黑色素少。短文第四段第二、三句提到“希洛测量了志愿者尿液中褪黑色素的一种分解产物的浓度,发现咖啡因摄入者的褪黑色素浓度是无咖啡因摄入者的一半”,故选A。
转载请注明原文地址:https://kaotiyun.com/show/Jj1d777K
本试题收录于:
职称英语卫生类C级题库职称英语分类
0
职称英语卫生类C级
职称英语
相关试题推荐
ItiscommonforAmericanstohavedifferent"circlesoffriends"suchaschurchfriends,workfriends,orsportsfriends.【R1】__
Ifyouintendusinghumorinyourtalktomakepeoplesmile,youmustknowhowtoidentifysharedexperiencesandproblems.Your
Ifyouintendusinghumorinyourtalktomakepeoplesmile,youmustknowhowtoidentifysharedexperiencesandproblems.Your
1.Ofalltheareasoflearningthemostimportantisthedevelopmentofattitudes.Emotionalreactionsaswellaslogicalthoug
FRIENDSHIP0Ibelievethatnothingmattersasmuchashavingacoupleofreallygood00friends.Theyhelpyoufeell
FRIENDSHIP0Ibelievethatnothingmattersasmuchashavingacoupleofreallygood00friends.Theyhelpyoufeell
FRIENDSHIP0Ibelievethatnothingmattersasmuchashavingacoupleofreallygood00friends.Theyhelpyoufeell
TheshoemakerBillBirdisashoemakerwhocannotmakeshoesfastenoughforhisgrowingnumberofcustomers—andhecharges
AImprovementinResearchingDiseasesBTheResultsofPlantDiseasesCMistakemadeinDiagnosisDKillingInsectsEAMaj
随机试题
患者,男性,45岁,颅脑损伤住院治疗,行冬眠降温疗法,下列护理不正确的是
鲎试验阳性表明
炮制法半夏的辅料应选用()。
标志着中国半殖民地半封建社会基本形成的不平等条约是()。
一、注意事项1.申论考试是对考生阅读理解能力、综合分析能力、提出和解决问题能力以及文字表达能力的测试。2.作答参考时限:阅读资料40分钟,作答110分钟。3.仔细阅读给定资料,按照后面提出的“申论要求”依次作答。二、给定资料
某市政府所属A行政机关作出行政处罚决定后被撤销,其职能由市政府所属B行政机关继续行使,受到行政处罚的公民不服,准备提起行政复议,此时他应以()为行政复议被申请人。
加拿大医生潘菲尔德用电刺激法研究颞叶时发现,微弱的电刺激能使病人回忆起童年时的一些事情。该研究结果支持脑功能的
风险分析包括:风险识别、(16)、风险评估、(17)。
【S1】【S10】
Whatcanbeinferredfromthefirstparagraph?Accordingtothepassage,thesecondwaveoflawsuitsinthemusicindustrywas
最新回复
(
0
)