新【托福阅读】材料备考：肺部的味觉感应.doc

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2、tonguetotastebittersubstancesarealsofoundonthesmoothmuscleofthelungs・Researcherswerestudyingthereceptorsonsmoothlungmusclesthatregulatecontractionandrelaxationoftheairways・That'swhentheymadethediscovery—-hichwassounexpectedthattheresearchersthemselveswereskeptica1・Fin

3、ally,theybecameconvincedthatthereceptorswerereallythere,thoughnotclusteredintastebudsastheyareonthetongue.Thescientiststhenexposedhumanandmouseairwajrstovariousbittercompoundstogaugetheeffects・Manytoxiccompoundsarebitter,sotheresearchersexpectedthelungmuscletotenseupa

4、ndcontract—tocompelthebreathertomoveawayfromwhateverwasbitterandperhapstoxic・But,inasecondsurprise,bittercompoundsrelaxedandopenedairwaysbetterthananyexistingasthmadrug・ThestudyisinthejournalNatureMedicine・[DeepdkDeskptmdeetdl・,"Bittertastereceptorsonairwaysmoothmuscl

5、ebronchodilatebylocalizedcalciumsignalingandreverseobstruction"]Researcherswillconlinuetosearchfortheroleofthereceptors・Meanwhile,theworkrepresentsasurprisingnewleadinthesearchfordrugstotreatasthma,emphysemaorchronicbronchitis・―ynthiaGraber来源于：小马过河相关推荐：托福阅读常出现的9个深度句托福

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