29. Which of the following drugs prolongates bleeding time?

a. aspirin

b. heparin

c. warfarin

d. all of the above

e. none of the above

30. Vitamin K deficiency may lead to spontaneous bleeding, because vit K controls formation of clotting factors:

a. II, VII, IX, X

b. IX, X, XI, XII

c. VIII, IX

d. fibrinogen only

e. tissue factor

31. Which of the following substances is necessary for clot dissolution?

a. plasmin

b. thrombin

c. tissue factor

d. warfarin

e. none of the above

32. Which of the following descriptions represents symptoms of megaloblastic anemia?

a. low MCV, iron deficiency, high bilirubin

b. low MCH, prolongated bleeding time

c. low MCV, high MCH, iron deficiency

d. high MCV, B12 deficiency, high bilirubin

e. high reticulocytes, high MCV, high B12

33. Which of the following blood cells may release histamine at site of inflammation?

a. RBC

b. lymphocytes T

c. eosinophils

d. basophils

e. neutrophils

34. What is the half-life of the platelets?

a. 1-2 hours

b. 1-2 days

c. 1-2 weeks

d. 1-2 months

e. 1-4 months

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