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【简答题】
甲图为某种激素分泌、运输和作用的模式图，为正常人在摄取葡萄糖后血糖含量的变化曲线，丙图表示两种机体免疫异常引起的糖尿病示意图，据图回答下列问题： 图丙中由桨细胞产生的抗体Y 1 与胰岛B细胞上的受体结合，导致对葡萄糖的敏感度降低，胰岛素的分泌量减少，血糖浓度升高。图中抗体Y 2 与靶细胞上的胰岛素受体结合，使（）不能发挥作用，从而使血糖浓度升高。
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