Question 1

Which of the following best describes the role of von Willebrand factor (vWF) in hemostasis?

Accepted Answer

vWF is a protein generated by the vessel endothelium that mediates platelet adhesion to exposed collagen fibers and serves as a carrier for coagulation factor VIII.

Question 2

A patient presents with easy bruising, frequent infections, and a low platelet count. Bone marrow biopsy reveals replacement by malignant cells. What is the most likely diagnosis?

Accepted Answer

Leukemia

Question 3

Which vitamin is essential for the synthesis of clotting factors, and what is the consequence of its deficiency?

Accepted Answer

Vitamin K; deficiency leads to production of inactive clotting factors and abnormal bleeding

Question 4

Which of the following is a common manifestation of thrombocytopenia?

Accepted Answer

Petechiae and purpura

Question 5

A patient develops widespread microthrombi and severe hemorrhage following major trauma. Laboratory tests show consumption of all available coagulation proteins and platelets. What is the most likely diagnosis?

Accepted Answer

Disseminated Intravascular Coagulation (DIC)

Question 6

Which of the following is a function of antithrombin III in the regulation of blood coagulation?

Accepted Answer

It inactivates coagulation factors and neutralizes thrombin.

Question 7

Which pathway(s) in the coagulation cascade ultimately result in the formation of prothrombin activator?

Accepted Answer

Both intrinsic and extrinsic pathways

Question 8

Which of the following conditions is most likely to cause hypercoagulability due to increased platelet function?

Accepted Answer

Atherosclerosis

Question 9

A patient with diabetes mellitus and elevated cholesterol is at increased risk for which of the following complications due to endothelial damage?

Accepted Answer

Atherosclerotic plaque formation and thrombosis

Question 10

Which of the following is a hereditary disorder characterized by a deficiency of factor VIII?

Accepted Answer

Hemophilia A

Question 11

Which of the following best explains why blood clotting is important during an infection?

Accepted Answer

It immobilizes and eliminates bacteria by forming a barrier and acts as a scaffold for immune cells.

Question 12

Which of the following is most consistent with bleeding from a vascular disorder?

Accepted Answer

Petechiae, purpura, and fragile capillaries

Question 13

Which of the following is a possible cause of hypercoagulability due to stasis of blood flow and increased concentrations of coagulation factors?

Accepted Answer

Prolonged immobility

Question 14

Which organ produces and stores most clotting factors, and what vitamin does it use for synthesis?

Accepted Answer

Liver; vitamin K

Question 15

A patient with scurvy presents with bleeding due to poor collagen synthesis. Which vitamin deficiency is responsible?

Accepted Answer

Vitamin C

Question 16

Which of the following is a plasma protein that acts as an anticoagulant by inactivating factors V and VIII?

Accepted Answer

Protein C

Question 17

Which of the following equations correctly represents the conversion of prothrombin to thrombin in the coagulation cascade?

Accepted Answer

$$\mathrm{Prothrombin} + \mathrm{Prothrombin\ Activator} \rightarrow \mathrm{Thrombin}$$

Question 18

Which of the following is a rare inherited bleeding disorder also known as Christmas disease?

Accepted Answer

Hemophilia B

Question 19

Which of the following best describes the process of clot dissolution?

Accepted Answer

Clot dissolution begins shortly after formation and allows blood flow to be reestablished.

Question 20

A patient presents with purple areas of bruising and pinpoint purplish-red spots on the skin. Laboratory tests reveal a low platelet count. Which condition is most likely?

Accepted Answer

Thrombocytopenia

22 patho

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