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括约肌（英语：Sphincter）是人或一些动物身上的一种肌肉类型。这种类型的肌肉分布在管腔壁，当收缩的时候管腔就会被关闭，当放松的时候管腔就会开放。人的肛门、尿道、膀胱、回肠末端与盲肠的交界处还有胃部的贲门和幽门都有括约肌。\n

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