托福阅读速度有哪些要求

Take a deep Taste anything? Actually, your lungs Because scientists have discovered that the same receptors that exist on the tongue to taste bitter substances are also found on the smooth muscle of the

Researchers were studying the receptors on smooth lung muscles that regulate contraction and relaxation of That’s when they made the discovery—which was so unexpected that the researchers themselves were

Finally, they became convinced that the receptors were really there, though not clustered in taste buds as they are on the The scientists then exposed human and mouse airways to various bitter compounds to gauge the

Many toxic compounds are bitter, so the researchers expected the lung muscle to tense up and contract—to compel the breather to move away from whatever was bitter and perhaps But, in a second surprise, bitter compounds relaxed and opened airways better than any existing asthma The study is in the journal Nature [Deepak Deshpande et , "Bitter taste receptors on airway smooth muscle bronchodilate by localized calcium signaling and reverse obstruction"]

Researchers will continue to search for the role of the Meanwhile, the work represents a surprising new lead in the search for drugs to treat asthma, emphysema or chronic

—Cynthia Graber

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