托福阅读机经背景复习：味觉系统

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1、智课网TOEFL备考资料托福阅读机经背景复习：味觉系统摘要：托福阅读机经背景复习：味觉系统。广泛的托福阅读背景知识积累，有助于托福阅读速度和准确率的提升。托福阅读文章分为自然科学、人文科学、互联网等几大类，如果同学们平时能对这些种类的文章都有所涉猎，托福阅读考试中遇到相关的话题就会有非常熟悉的感觉。下面小编给大家提供一篇关于人类味觉系统的背景材料，希望能拓宽同学们的阅读面。Takeadeepbreath.Tasteanything?Actually，yourlungsmay.Becausescientis

2、tshavediscoveredthatthesamereceptorsthatexistonthetonguetotastebittersubstancesarealsofoundonthesmoothmuscleofthelungs.Researcherswerestudyingthereceptorsonsmoothlungmusclesthatregulatecontractionandrelaxationoftheairways.That’swhentheymadethediscovery—wh

3、ichwassounexpectedthattheresearchersthemselveswereskeptical.Finally，theybecameconvincedthatthereceptorswerereallythere，thoughnotclusteredintastebudsastheyareonthetongue.Thescientiststhenexposedhumanandmouseairwaystovariousbittercompoundstogaugetheeffects.

4、Manytoxiccompoundsarebitter，sotheresearchersexpectedthelungmuscletotenseupandcontract—tocompelthebreathertomoveawayfromwhateverwasbitterandperhapstoxic.But，inasecondsurprise，bittercompoundsrelaxedandopenedairwaysbetterthananyexistingasthmadrug.Thestudyisi

5、nthejournalNatureMedicine.[DeepakDeshpandeetal.，“Bittertastereceptorsonairwaysmoothmusclebronchodilatebylocalizedcalciumsignalingandreverseobstruction”]Researcherswillcontinuetosearchfortheroleofthereceptors.Meanwhile，theworkrepresentsasurprisingnewleadin

6、thesearchfordrugstotreatasthma，emphysemaorchronicbronchitis.—CynthiaGraber大量的托福阅读背景知识积累对于托福阅读非常有帮助，不管是英文原版还是中文翻译版，同学们都可以大量去阅读，熟悉内容即可。相关推荐:托福阅读机经背景复习：香港居留权不安全托福阅读机经背景复习：成功的法宝托福阅读机经背景复习：女性更容易泄密相关字搜索：托福阅读机经背景复习