题目内容

A65-year-oldslightlycyanoticmanpresentstohisphysiciancomplainingofruritusandnosebleeds.Abloodtestrevealsahematocritof62%,leadingtothediagnosisofpolycythemiavera.Treatmentincludesaspirintopreventthrombosisandperiodicphlebotomytoreducethehematocrit.Thereductioninhematocritisbeneficialbecauseitdoeswhichofthefollowing?

A. Reducesbloodvelocity
B. Decreasescardiacoutput
C. Reducesbloodviscosity
D. Increasesarterialoxygensaturation

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A35-year-oldwomanpresentstoherfamilyphysician’sofficewithfatigueofatleast3months’duration.Heronlyexplanationisthatkeepingupwithhertwin4-year-oldsreallytiresherout,andshedoesnotevenhaveenoughenergytomakenutritiousmealsforherandherhusband.VitalsignsandECGarenormal,butathirdheartsoundisheardwithauscultationandsheispale.Bloodresultsareasfollows:Hb,8g/dL;hematocrit,30%;MCV,115fL;WBC,8000/μL;platelets,200,000/μL.Adeficiencyofwhichofthefollowingsubstancescanmostlikelyaccountforthesefindings?

A. Folate
B. Glucose-6-phosphatase
C. Niacin
D. Iron

A67-year-oldwomanwithahistoryofvenousthromboembolismisplacedonwarfarin(Coumadin;Bristol-MyersSquibbCompany,NewYork,NYUSA)prophylactically.ThebloodconcentrationofCoumadinbecomestoohighandbleedingoccurs.Thebleedingcanbestbetreatedbytheadministrationofwhichofthefollowing?

A. Platelets
B. Thrombin
C. VitaminK
D. Fibrinogen

外源性凝血途径的始动因子是

A. FⅡ
B. FⅦ
C. FⅢ
D. FⅠ

某人的血细胞与B型血的血清凝集,而其血清与B型血的血细胞不凝集,此人的血型为

A型
B型
C. O型
D. AB型
E. RH阴性