When an asthma attack hit ,the air we shrink and makes breathing difficult ,to keep air flowing ,the suffer must take medication to relax passager's muscle open and backup,but a couple year ago,research discovered airway contain bitter taste acceptors lets ones on the tongue,after exposure to a bitter substance, the acceptors can expand the airway more quickly and more effectively than the commonly used treatment.

　　Researcher examined airway tissue to learn why the bitterness  make the  muscles relax,during an asthma attack,calsin flows into the selfof the airway and contribute to muscle constraction.

　　but bitter substances block the channel that allow the calcement desell ,that is the opposite of bitter bill.