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下面三幅图表示的是人体对病原体的防御功能，请分析图片并回答下列问题： （1）环境中众多的病原体不易伤害我们，首先是因为我们的皮肤具有保护功能，抵挡病原体的侵入，如______（填图1、图2、图3）所示，这属于第______道防线． （2）以上三幅图所示的免疫作用是人体生来就有的，叫做______性免疫． （3）为预防某些传染病（如甲型H1N1流感），对易感人群进行预防接种．接种疫苗后能刺激人体产生______，这属于人体的第______道防线．
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