【单选题】【消耗次数：1】
过敏原的定义是什么
①
身体对外界物质产生的过度反应
②
诱导机体产生过敏的抗原物质
③
个体或者个体家族成员在接触过敏原时，倾向于产生IgE类抗体的免疫应答并出现过敏性疾病倾向的特质
④
机体免疫系统对环境中典型无害物质产生的超敏反应性疾病
⑤
在接触过敏原后数分钟到数小时内迅速发生的危及生命的严重症候群
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相关题目
【单选题】
正常机体不会对下列物质发生免疫应答（ ）
①
异种物质
②
同种异体物质
③
成分、结构改变的自身物质
④
胚胎期机体免疫系统接触过的物质
⑤
胚胎期机体免疫系统未接触过的物质
【单选题】
过敏反应的分类
①
IgE 介导以组胺的释放为基础，迅速发病 (< 1h)大量过敏疾病
②
IgG或IgM介导直接针对靶细胞的免疫反应，例如：输血反应,免疫血液病
③
IgG介导形成免疫复合物，迟发型，导致很多慢性疾病，包括皮肤病
④
细胞介导接触性皮炎，移植排斥反应等
⑤
以上都对
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