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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(guān)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(guān)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.Becausescient
2、istshavediscoveredthatthesamereceptorsthatexistonthetonguetotastebittersubstancesarealsofoundonthesmoothmuscleofthelungs.Researcherswerestudyingthereceptorsonsmoothlungmusclesthatregulatecontractionandrelaxationoftheairways.That’swhentheymadethediscover
3、y—whichwassounexpectedthattheresearchersthemselveswereskeptical.Finally，theybecameconvincedthatthereceptorswerereallythere，thoughnotclusteredintastebudsastheyareonthetongue.Thescientiststhenexposedhumanandmouseairwaystovariousbittercompoundstogaugetheef
4、fects.Manytoxiccompoundsarebitter，sotheresearchersexpectedthelungmuscletotenseupandcontract—tocompelthebreathertomoveawayfromwhateverwasbitterandperhapstoxic.But，inasecondsurprise，bittercompoundsrelaxedandopenedairwaysbetterthananyexistingasthmadrug.The
5、studyisinthejournalNatureMedicine.[DeepakDeshpandeetal.，“Bittertastereceptorsonairwaysmoothmusclebronchodilatebylocalizedcalciumsignalingandreverseobstruction”]Researcherswillcontinuetosearchfortheroleofthereceptors.Meanwhile，theworkrepresentsasurprisin
6、gnewleadinthesearchfordrugstotreatasthma，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(guān)推薦:托福閱讀機經(jīng)背景復習：香港居留權(quán)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(guān)字搜索：托福閱讀機經(jīng)背景復習
