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1、智課網(wǎng)TOEFL備考資料托福閱讀機經(jīng)背景復習：味覺系統(tǒng)摘要：托福閱讀機經(jīng)背景復習：味覺系統(tǒng)。廣泛的托福閱讀背景知識積累，有助于托福閱讀速度和準確率的提升。托福閱讀文章分為自然科學、人文科學、互聯(lián)網(wǎng)等幾大類，如果同學們平時能對這些種類的文章都有所涉獵，托福閱讀考試中遇到相關的話題就會有非常熟悉的感覺。下面小編給大家提供一篇關于人類味覺系統(tǒng)的背景材料，希望能拓寬同學們的閱讀面。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大量的托福閱讀背景知識積累對于托福閱讀非常有幫助，不管是英文原版還是中文翻譯版，同學們都可以大量去閱讀，熟悉內(nèi)容即可。相關推薦:托福閱讀機經(jīng)背景復習：香港居留權不安全托福閱讀機經(jīng)背景復習：成功的法寶托福閱讀機經(jīng)背景復習：女性更容易泄密相關字搜索：托福閱讀機經(jīng)背景復習
