第三章 血液第三节 生理性止血一、生理性止血的基本过程

题?1.5 小结РHemostasis is the stoppage of bleeding, which is vitally important when blood vessels are damaged.Р1.1 生理性止血的定义Р1.2 生理性止血过程Р1.血管收缩(vessel contraction)Р2.血小板止血栓的形成?(platelet plug formation)Р3.血液凝固(blood coagulation)Р血管损伤Р血管收缩Р生理性止血过程示意图РFollowing damage, there is an immediate reflex that promotes vasoconstriction, thus diminishing blood loss.Р血管损伤Р血管收缩Р血管内皮下组织暴露Р血小板激活?(黏附、聚集、释放)Р血小板止血栓形成(初步止血)Р生理性止血过程示意图РWhen platelets adhere to the damaged vessel, they release serotonin, ADP and Thromboxane A2. The positive feedback promotes the formation of a platelet plug.Р血管损伤Р血管收缩Р血管内皮下组织暴露Р血小板激活?(黏附、聚集、释放)Р血小板止血栓形成(初步止血)Р血凝块形成(二期止血)Р凝血系统激活Р纤维蛋白形成Р生理性止血过程示意图РThrombin converts fibrinogen to fibrin. Platelets and red blood cells e caught in this mesh of fiber, thus the formation of a blood clot.