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正常人体有完整的止血机能,包括血管、血小板及血液凝固三方面的因素,三者互相影响,互相依赖,共同完成止血作用。一、正常止血过程 (一) 血管作用:小静脉,毛细血管和微小动脉受伤后的止血作用,主要依俈血管内膜的直接愈合及血管收缩。当这些小血管受伤后,局部的血管立即发生反射性收缩,
Normal human body has a complete hemostatic function, including blood vessels, platelets and blood coagulation of three factors, the three affect each other, rely on each other to jointly complete the role of hemostasis. First, the normal process of hemostasis (A) of the role of blood vessels: small veins, capillaries and small arteries after the injury to stop bleeding, mainly in accordance with the direct intima of the vascular intima and vasoconstriction. When these small blood vessels are injured, the local vessels immediately reflex contraction,