Platelet Plug Formation and Aggregation
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Questions and Answers

What is the role of ADP in platelet function?

  • Promoting vascular smooth muscle contraction
  • Strengthening the fibrin clot
  • Inhibiting platelet aggregation
  • Inducing platelet adherence and degranulation (correct)
  • Which molecule is responsible for mediating platelet constriction?

  • Thromboplastin
  • Serotonin (correct)
  • ADP
  • Thromboxane A2
  • What is the primary function of Thromboxane A2 in platelet aggregation?

  • Strengthening the fibrin clot
  • Inhibiting platelet degranulation
  • Stimulating platelet adherence (correct)
  • Promoting vasodilation
  • How do Prostacyclin I2 and Nitric Oxide contribute to hemostasis?

    <p>Inhibit platelet aggregation</p> Signup and view all the answers

    What is the main role of Thrombin in the clotting pathway?

    <p>Converting fibrinogen to fibrin at the site of injury</p> Signup and view all the answers

    Which molecule strengthens the plug formed by aggregated platelets?

    <p>Serotonin</p> Signup and view all the answers

    What is the primary role of platelets in the process of hemostasis?

    <p>Forming a platelet plug</p> Signup and view all the answers

    Which glycoprotein is responsible for linking platelets together to form platelet plugs?

    <p>GPIIb-IIIa</p> Signup and view all the answers

    During which stage of hemostasis does the activation of coagulation factors lead to the production of thrombin?

    <p>Secondary hemostasis</p> Signup and view all the answers

    What is the function of thromboxane A2 (TxA2) in the context of platelet activity?

    <p>Potent vasoconstrictor</p> Signup and view all the answers

    Which component is responsible for attaching activated platelets to von Willebrand Factor (vWF)?

    <p>GPIb</p> Signup and view all the answers

    In the context of hemostasis, where does fibrinolysis occur?

    <p>After the clot is no longer needed</p> Signup and view all the answers

    What is the primary function of nitric oxide in hemostasis?

    <p>Inhibits platelet adhesion, aggregation, and binding of fibrinogen</p> Signup and view all the answers

    Which molecule is a powerful vasodilator and interferes with platelet formation and aggregation?

    <p>Prostacyclin</p> Signup and view all the answers

    During primary hemostasis, what is the main function of vonWillebrand Factor (vWF)?

    <p>Attracts other platelets to the site of injury</p> Signup and view all the answers

    What initiates the vascular spasm during the hemostasis process?

    <p>TxA2 and ADP expression</p> Signup and view all the answers

    How do platelets adhere to exposed collagen during hemostasis?

    <p>Utilizing vWF at specific receptors</p> Signup and view all the answers

    What is the main outcome of the secondary hemostasis process?

    <p>Activation of clotting factors for coagulation</p> Signup and view all the answers

    In the intrinsic pathway, which factor is involved in converting prothrombin to thrombin?

    <p>Factor Xa</p> Signup and view all the answers

    What is the primary activator of prothrombin in the final common pathway of coagulation?

    <p>Factor Xa</p> Signup and view all the answers

    Which activated factor contributes to the activation of Factors XIa and VIIIa in the intrinsic pathway?

    <p>Factor XIIa</p> Signup and view all the answers

    In the coagulation cascade, what is the role of Factor VIII?

    <p>Activates Factor IX to IXa</p> Signup and view all the answers

    Which factor is crucial for converting prothrombin to thrombin in the final common pathway?

    <p>Factor X</p> Signup and view all the answers

    In the prothrombinase complex, what is the role of factor Va?

    <p>Increases the activity of factor Xa</p> Signup and view all the answers

    Which factor is involved in the activation of factor IX to factor IXa in the extrinsic pathway?

    <p>Factor VIIa</p> Signup and view all the answers

    How does vitamin K impact the production of prothrombin and other clotting factors by the liver?

    <p>Is required for normal synthesis of clotting factors by the liver</p> Signup and view all the answers

    Which pathway is specific for coagulation initiation outside the intravascular space and is measured by PT and INR tests?

    <p>Extrinsic Pathway</p> Signup and view all the answers

    What is the function of Thrombin in the final common pathway of coagulation?

    <p>Converts fibrinogen to fibrin</p> Signup and view all the answers

    What is the function of prothrombinase in the clotting pathway?

    <p>Converts prothrombin to thrombin</p> Signup and view all the answers

    Which coagulation factor is involved in both the intrinsic and extrinsic pathways of the clotting cascade?

    <p>Factor VII</p> Signup and view all the answers

    In the final common pathway of the clotting cascade, what is the primary function of fibrin?

    <p>Forms a mesh to stabilize the clot</p> Signup and view all the answers

    Which of the following accurately describes the extrinsic pathway of the clotting cascade?

    <p>Initiated by damage to blood vessel walls</p> Signup and view all the answers

    What role do coagulation factors play in the intrinsic pathway of the clotting cascade?

    <p>Form prothrombinase complex</p> Signup and view all the answers

    What is the significance of the final common pathway in the clotting cascade?

    <p>It produces fibrin from fibrinogen</p> Signup and view all the answers

    Factor XII is the first plasma protein activated in the intrinsic pathway of the clotting cascade.

    <p>True</p> Signup and view all the answers

    Thrombin plays a role in the activation of Factors XIa and VIIIa in the intrinsic pathway of the clotting cascade.

    <p>True</p> Signup and view all the answers

    The final common pathway of the clotting cascade involves the conversion of prothrombin to thrombin by Xa and Va.

    <p>True</p> Signup and view all the answers

    In the extrinsic pathway, Factor IX is activated to IXa by Factor XIa.

    <p>False</p> Signup and view all the answers

    Prothrombinase complex consists of Xa, Va, and activated platelets in the final common pathway of coagulation.

    <p>True</p> Signup and view all the answers

    The intrinsic pathway of the clotting cascade is initiated by blood trauma and exposure to collagen.

    <p>True</p> Signup and view all the answers

    Thrombin generated from the extrinsic pathway is sufficient to provide adequate, sustained coagulation.

    <p>False</p> Signup and view all the answers

    The final common pathway of the clotting cascade involves only the intrinsic pathway.

    <p>False</p> Signup and view all the answers

    Prothrombinase is responsible for converting fibrinogen to fibrin in the clotting pathway.

    <p>False</p> Signup and view all the answers

    The extrinsic pathway of the clotting cascade is activated when coagulation is initiated inside the intravascular space.

    <p>False</p> Signup and view all the answers

    In the intrinsic pathway of the clotting cascade, everything necessary for clotting is found outside the blood.

    <p>False</p> Signup and view all the answers

    Thrombin plays a significant role in activating platelets and clotting factors in the positive feedback loop of the clotting cascade.

    <p>True</p> Signup and view all the answers

    In the final common pathway of the clotting cascade, the extrinsic and intrinsic pathways merge at factor Xa to produce thrombin.

    <p>True</p> Signup and view all the answers

    Factor III, also known as Tissue Factor (TF), is a plasma protein involved in the intrinsic pathway.

    <p>False</p> Signup and view all the answers

    Factor VIIa forms a complex with TF (Factor III) in the extrinsic pathway to activate factor X to Xa.

    <p>True</p> Signup and view all the answers

    In the prothrombinase complex, factor Va and activated platelets help convert factor IX to IXa in the intrinsic pathway.

    <p>False</p> Signup and view all the answers

    The extrinsic pathway is faster than the intrinsic pathway and is measured by PT and INR tests.

    <p>True</p> Signup and view all the answers

    The liver requires vitamin K for the normal production of prothrombin and other clotting factors in both the extrinsic and intrinsic pathways.

    <p>False</p> Signup and view all the answers

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