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[单选题]
M受体的生理作用不包括下列哪项( )
A
a 缩瞳b 心脏抑制c 血管舒张d 胃肠道平滑肌舒张
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试题答案:
D
答案解释:
熟悉M、N、α、β受体的分布和生理效应。M受体可以使瞳孔缩小、心脏抑制、血管舒张、支气管平滑肌胃肠道平滑肌膀胱逼尿肌收缩,但会使尿道括约肌、肛门括约肌舒张。
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