A Complete Collection of 100000 Whys
Fav十万个为什么
为什么人体需要免疫？
1、人体需要免疫来识别和清除病原体，如细菌、病毒和真菌，这些病原体可能引起疾病。
2、免疫系统通过产生抗体和激活免疫细胞来保护身体免受感染，这是维持健康的关键。
3、免疫系统能够记住过去的感染，当再次遇到相同的病原体时能更快地做出反应，这就是免疫记忆。
4、免疫不仅防御外部病原体，还能清除体内的异常细胞，如癌细胞，从而预防疾病。
5、免疫有助于身体修复受伤组织，促进伤口愈合和恢复健康。
总之，免疫系统是人体健康的重要防线，它通过识别、清除病原体和异常细胞，以及促进修复，保护我们免受疾病侵害。
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