【单选题】【消耗次数：1】
morphine镇痛作用原理是
①
激动中枢阿片受体使P物质增多
②
激动中枢阿片受体使P物质减少
③
阻断中枢阿片受体使P物质减少
④
阻断中枢阿片受体使P物质增多
⑤
以上均不是
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相关题目
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药物与特异性受体结合后，可能激动受体，也可能阻断受体，这取决于：
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药物与特异性受体结合后，可能激动受体，也可能阻断受体，这取决于
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药物的作用强度
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药物的剂量大小
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药物的脂/水分配系数
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