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为什么pi肤划破后血会自动凝结?

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为什么pi肤划破后血会自动凝结?

pi肤哪儿破了,哪儿就会有红se的血ye渗chu,而这些渗chu的血ye,很快又会凝成一团,堵住划破的地方一这是血小板对伤口zuo抢救工作的结果。血ye里住着许许多多血小板,它一从血guan里liuchu来,就立即“粉shen碎骨”,放chu的血小板因子和血浆凝血致活酶原,在钙离子的帮助下,相互作用形成凝血致活酶,血ye里的凝血酶原在钙离子以及凝血致活酶的作用下,转变成少量凝血酶,血浆中的纤维dan白原在凝血酶和血小板因子的作用下,变成网状固ti的纤维dan白。纤维dan白是人ti里的"水泥",它会很快地凝固,凝成一gengen又细长又长的纤维。这些纤维再相互jiao错、重叠,终于堵住了"决口"使血ye不再往外liu了。过了几天,伤口就凝结成了jianying的痂pi。

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