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Skin can prevent some germs from entering the human body
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  • 人体免疫第一道防线
    皮肤、黏膜及其分泌物
    皮肤是人体与外界的屏障,呼吸道黏膜上纤毛清扫阻挡异物进入人体,皮肤分泌物能杀死病菌。
  • 人体免疫第二道防线
    体液中的杀菌物质、吞噬细胞
    当病菌进入体内后, “先头部队”吞噬细胞(巨噬细胞和噬中性球)会率先赶赴现场来溶解、吞噬和消灭病菌。
  • 人体免疫第三道防线
    免疫器官、免疫细胞
    当病菌深入体内后,免疫器官将派遣出“特种部队”淋巴细胞(T细胞和B细胞),T细胞会消灭一切敌人,B细胞会产生抗体与之战斗。
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你知道过敏是怎么产生的么?
过敏是免疫系统对环境中本来无害的物质所产生的一种不恰当和过度的免疫反应
过敏性疾病可累及多系统、多器官,涵盖的疾病种类很多,如特应性皮炎、支气管哮喘、过敏性鼻炎等等。
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过敏原首次进入机体,诱导B细胞分泌IgE抗体
过敏原首次进入机体,诱导B细胞分泌IgE抗体
IgE结合在肥大细胞、 嗜碱粒细胞表面,并使其处于致敏状态
当相同的过敏原再次与IgE抗体结合,导致肥大细胞或嗜碱粒细胞膜破裂
细胞膜破裂后,释放预存的组胺、 白三烯等炎性介质,引起过敏
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当igE介导的过敏发生时,血液中igE数量偏多,从而引起身体各种过敏反应
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