【单选题】【消耗次数：1】
强心苷加强心肌收缩力是通过
①
阻断心迷走神经
②
直接作用于心肌
③
兴奋β受体
④
使交感神经递质释放
⑤
抑制心迷走神经递质释放
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相关题目
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迷走神经末梢释放的乙酰胆碱可引起心率减慢是由于（）
①
窦房结细胞对K<sup>+</sup> 通透性降低
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窦房结细胞对K<sup>+</sup> 通透性增加
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窦房结细胞对Cl<sup>-</sup> 通透性增加
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