【单选题】【消耗次数：1】
morphine抑制呼吸的主要原因是
①
作用于导水管周围灰质
②
作用于蓝斑核
③
降低呼吸中枢对血液CO2张力的敏感性
④
作用脑干极后区
⑤
作用迷走神经背核
参考答案：
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