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
Caffeine Caffeine is probably the most widely used drug in the world. Humans have been consuming caffeine for hundreds of yea
Caffeine Caffeine is probably the most widely used drug in the world. Humans have been consuming caffeine for hundreds of yea
admin
2012-12-09
36
问题
Caffeine
Caffeine is probably the most widely used drug in the world. Humans have been consuming caffeine for hundreds of years, primarily in the form of coffee, tea, and cocoa. Habitual coffee and tea drinkers had long been observed to have a lower incidence of non-melanoma(黑色素瘤) skin cancers, although no one knew why. A recent study found that caffeine affects skin cells damaged by ultraviolet radiation, a main cause of skin cancer. Caffeine interferes with a protein that cancerous cells need to survive, leaving the damaged cells to die before they become cancerous. Drinking caffeinated coffee has also been associated with a decreased incidence of endometrial(予宫内膜的) cancer - that is, cancer of the cells lining the uterus - The strongest effect appears to be in overweight women, who are at greatest risk for the disease. Researchers believe blood sugar, fat cells, and estrogen(雌性激素) may play a role. Although the mechanism remains unknown, people who drink more than two cups of coffee or tea a day reportedly have about half the risk of developing chronic liver disease as those who drink less than one cup of coffee daily; caffeinated coffee has also been associated with lowered risk of cirrhosis(肝硬化) and liver cancer.
While many of caffeine’s undesirable effects, such as elevated heart rate and blood pressure, are brief, some short-term benefits, including pain relief, increased alertness, and increased physical endurance, have also been attributed to caffeine. As a component of numerous over-the-counter diet pills and pain relievers, caffeine increases their effectiveness and helps the body absorb them more quickly. By constricting(收缩) blood vessels in the brain, it can alleviate headaches -even migraines(偏头痛)–and can help counter the drowsiness(眩晕)caused by antihistamines(抗组胺药).
Caffeine does not alter the need for sleep, but it does offer a temporary solution to fatigue for people who need to stay alert. Research has shown that sleep-deprived individuals who consumed caffeine had improved memory and reasoning abilities, at least in the short term. Studies of runners and cyclists have shown that caffeine can improve their stamina-hence its addition to energy-boosting sports drinks.
People who consume a lot of caffeine regularly may develop temporary withdrawal symptoms, headache being the most common, if they quit or cut back on it abruptly. Fortunately, these symptoms last only a day or two in most cases. Individuals who are more sensitive to the stimulatory side effects of caffeine may want to avoid it, but most doctors agree that the equivalent of three cups of coffee a day does not harm healthy people. There is no medical basis to give up daily caffeine and many reasons to include a moderate amount in one’s diet.
Drinking coffee or tea may help
选项
A、lower the incidence of being overweight.
B、lower the incidence of non-melanoma skin cancer.
C、increase the incidence of endometrial cancer.
D、increase the incidence of liver cancer.
答案
B
解析
转载请注明原文地址:https://jikaoti.com/ti/rTOsFFFM
本试题收录于:
职称英语卫生类A级题库职称英语分类
0
职称英语卫生类A级
职称英语
相关试题推荐
ListentoSarahandMatthewtalkingaboutthepeopletheymetataparty.Whatdotheysayabouteachperson?Forquestions6-10
TheHistoryofFarmingBeforepeoplestartedfarming,theywenttotheforesttolookforplantsorfruittheycouldeat.Thi
TheHistoryofFarmingBeforepeoplestartedfarming,theywenttotheforesttolookforplantsorfruittheycouldeat.Thi
Herculeswasthetallestmanintheworld.Herculesworkedintheking’sgarden.
StressCanMakeYouSickScientistsarenowstudyinganewfieldofresearchwhichiscalledpsychoimmunology(心理免疫学).Itisb
AImprovementinResearchingDiseasesBTheResultsofPlantDiseasesCMistakemadeinDiagnosisDKillingInsectsEAMaj
YouwouldbeconsideredpoorinAmericaif______.Freemedicalcareandsubsidizedhousingmostprobablyexistin______tore
随机试题
整个行政绩效考核体系的中枢与核心是()
根据临床特点、病变的部位和病理改变,颞下颌关节紊乱病在临床可分为四类:()、()、()、()。
女性,35岁。腹痛,便秘3个月,加重10天。2年前患肺结核。查体:腹软,右下腹压痛,触及一鸡蛋大小包块,肠鸣音活跃。X线钡透:回盲部充盈缺损。PPD试验强阳性。肠结核最好发的部位是
确立会计核算空间范围所依据的会计基本假设是( )。
对未能按规定披露信息的企业、相关中介机构及负有直接责任的董事、高级管理人员和其他直接责任人员,情节严重的,交易商协会可建议中国人民银行给予( )。
作为货币政策工具,再贴现的缺点是( )。
对待竞争的正确看法是()
视觉的适宜刺激是波长()纳米的电磁波。
一项工程,甲工程队单独完成需要32天。在甲工程队工作5天后,因为有事调离,换成乙、丙两工程队共同完成。已知甲队3天的工作量相当于丙队2天的工作量,丙队4天的工作量相当于乙队5天的工作量。问甲队离开后,乙、丙两队还需要合作多少天,才能完成这项工程?(
BycitingexamplesofwomenemploymentinSweden,theauthorintendstoshowthatTheauthorwillprobablyagreewiththestate
最新回复
(
0
)