味觉的形成过程是怎么样的?
味质→味蕾细胞→膜离子通道(酸、咸)或膜受体→G蛋白→效应酶→第二信使→级联放大→动作电位→神经传导→意识。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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