Coagulation Cascade Quiz: Thrombin Burst and Clot Stabilization
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Questions and Answers

What is the primary function of Antithrombin III in the coagulation cascade?

  • Activate platelet aggregation
  • Enhance fibrin polymerization
  • Stabilize the fibrin clot
  • Inhibit factor IIa, Xa, and other coagulation factors (correct)

How does Heparin exert its anticoagulant action?

  • By inhibiting factor IIa and Xa (correct)
  • By activating platelets
  • By enhancing the activity of protein C
  • By stabilizing the fibrin clot

Which natural anticoagulant is produced by the liver to inhibit factors V & VIII activity?

  • Heparin
  • Protein S
  • Antithrombin III
  • Protein C (correct)

Which autocrine-paracrine mediator promotes vasodilation and inhibits platelet activation?

<p>Prostacyclin (B)</p> Signup and view all the answers

What is the primary function of Tissue Factor Pathway Inhibitor (TFPI) in the coagulation cascade?

<p>Inhibit extrinsic Tenase complex (D)</p> Signup and view all the answers

Why is Protein S important in the regulation of blood clotting?

<p>Activates protein C (C)</p> Signup and view all the answers

What is the role of anticoagulant agents in preventing insult from developing thrombi or dislodging emboli?

<p>Blocking steps in coagulation (B)</p> Signup and view all the answers

Which type of anticoagulant agent directly binds to thrombin to inhibit its function?

<p>Direct thrombin inhibitors (D)</p> Signup and view all the answers

What is the mechanism of action of Vitamin K inhibitors in the context of coagulation?

<p>Blocking the coagulative profile of Vitamin K dependent factors (A)</p> Signup and view all the answers

In fibrinolysis, what is the role of tissue plasminogen activator (t-PA)?

<p>Activating plasminogen into plasmin (B)</p> Signup and view all the answers

Which of the following is NOT a target for digestion by the non-specific protease plasmin during fibrinolysis?

<p>Factor V (B)</p> Signup and view all the answers

What is the main outcome of fibrinolysis in terms of blood vessels blocked by a clot?

<p>Complete dissolution of the fibrin clot (A)</p> Signup and view all the answers

Which of the following is a natural anticoagulant present in plasma?

<p>Antithrombin III (D)</p> Signup and view all the answers

Which enzyme is responsible for digesting and lysing fibrin clots?

<p>Plasmin (C)</p> Signup and view all the answers

Which of the following agents inhibits the action of vitamin K, thereby reducing the production of clotting factors?

<p>Warfarin (D)</p> Signup and view all the answers

Which of the following agents directly inhibits the action of thrombin?

<p>Rivaroxaban (B)</p> Signup and view all the answers

Which of the following agents inhibits the action of factor Xa, thereby preventing thrombin generation?

<p>Apixaban (D)</p> Signup and view all the answers

Which of the following mediators secreted by endothelial cells has potential anticoagulant action?

<p>Nitric oxide (NO) (B)</p> Signup and view all the answers

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