[单选题] 内源性和外源性凝血的主要区别是（）-湖北继续教育网网校

[单选题]

[单选题] 内源性和外源性凝血的主要区别是（）

A前者需要血小板磷脂表面，后者则不需要

B前者发生在血管内，后者发生在血管外

C前者只需体内因子，后者还需外加因子

D前者只需血浆因子，后者还需组织因子

E前者需要Ca2+，后者也需要Ca2+

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