超星 - 直播观看进阶题-1-单选 - 查题吧

单选题

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

单选题

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

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

单选题

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

单选题

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

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

单选题

外源性凝血途径的始动因子是

A. FⅡ
B. FⅦ
C. FⅢ
D. FⅠ

单选题

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

单选题

在左心室异常扩大,功能减退时能较好评价心脏泵血功能的指标是

A. 搏出量
B. 心排血量
C. 射血分数
D. 心指数
E. 射血指数

单选题

神经细胞动作电位下降支离子机制是

A. Na+内流
B. Cl-外流
Ca2+内流
D. Ca2+外流
E. K+外流

单选题

心室血液充盈主要靠

A. 心室收缩的挤压作用
B. 心室舒张的抽吸作用
C. 心房收缩的挤压作用
D. 血液的重力作用
E. 静脉的挤压作用

单选题

吸气末肺内压

A. 大于大气压
B. 小于胸内压
C. 等于胸内压
D. 小于大气压
E. 等于大气压

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