A52-year-oldmanisbroughttotheemergencydepartmentwithseverechestpain.Angiographydemonstratesaseverecoronaryocclusion.Athrombolyticagentisadministeredtoreestablishperfusion.Whichofthefollowingdoesthethrombolyticagentactivate?
A. Plasminogen
B. Prothrombin
C. Kininogen
D. Heparin
A42-year-oldpatientisscheduledforsurgerythatwilllikelyrequireatransfusion.Becausethepatienthasararebloodtype,anautologousbloodtransfusionisplanned.Priortosurgery,1500mLofbloodiscollected.Thecollectiontubescontaincalciumcitratetopreventcoagulation.Whichofthefollowingisthemechanismforcitrate’santicoagulativeaction?
Activatingplasminogen
B. Chelatingcalcium
C. Blockingthrombin
D. BindingfactorXII
瘀斑现象,近一个月来多次发生鼻出血,双亲为近亲婚配,家系中均无类似出血情况。实验室检查发现,外周血血小板计数正常,出血时间延长,凝血时间正常,血小板膜表面糖蛋白IIb显著降低,基因诊断证实糖蛋白IIb(GPIIb)基因错义突变。该患儿出血时间延长与血小板的那项功能有关:
A. 释放能力降低
B. 收缩能力降低
C. 黏附能力降低
D. 聚集能力降低
A65-year-oldslightlycyanoticmanpresentstohisphysiciancomplainingofruritusandnosebleeds.Abloodtestrevealsahematocritof62%,leadingtothediagnosisofpolycythemiavera.Treatmentincludesaspirintopreventthrombosisandperiodicphlebotomytoreducethehematocrit.Thereductioninhematocritisbeneficialbecauseitdoeswhichofthefollowing?
A. Reducesbloodvelocity
B. Decreasescardiacoutput
C. Reducesbloodviscosity
D. Increasesarterialoxygensaturation