首先是对外来病菌的抵抗作用。这是人体排斥外源性抗原异物的一种能力一种表现，是排斥非身体自身产生物要说免疫力对身体的作用。
举例说明，当身体在遭受细菌感染之后，免疫系统就会认出细菌表现，这种情况下就会调动大量的白细胞跟淋巴细胞来进行抵抗，同时还会将细菌吞噬，也就可以阻止细菌对身体造成的伤害。
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