Block 2 Biochem Clotting System

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  • 1/37 Questions

    Which of the following contains exposed collagen to which platelets bind during vascular injury?

    • Endothelial cells
    • Subendothelial cells
    • Platelets
    • Clotting factors
    • Von Willebrand Factor
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Biochemistry Quizzes & Trivia
About This Quiz

This quiz, titled 'Block 2 Biochem Clotting System', explores key aspects of the blood clotting process. It assesses knowledge on platelet function, coagulation pathways, and the role of various proteins in hemostasis, making it essential for learners focusing on biochemistry and medical studies.

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  • 2. 

    Which of the following is an INHIBITOR of platelet adhesion and aggregation?

    • Prostacyclin

    • Fibrin

    • Fibrinogen

    • Von Willebrand Factor

    • Thrombin

    Correct Answer
    A. Prostacyclin
    Explanation
    Prostacyclin is an inhibitor of platelet adhesion and aggregation. It is a potent vasodilator and prevents platelets from sticking together and forming clots. By inhibiting platelet activation, prostacyclin helps to maintain normal blood flow and prevent the formation of harmful blood clots.

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  • 3. 

    Platelet adhesion, the process of platelets binding to exposed subendothelial tissue after vascular injury, is primarily mediated by?

    • Endothelial cells

    • Subendothelial cells

    • Platelets

    • Clotting factors

    • Von Willebrand Factor

    Correct Answer
    A. Von Willebrand Factor
    Explanation
    Platelet adhesion, the process of platelets binding to exposed subendothelial tissue after vascular injury, is primarily mediated by Von Willebrand Factor. Von Willebrand Factor is a protein that is released by endothelial cells and binds to platelets, allowing them to adhere to the damaged blood vessel walls. This interaction between Von Willebrand Factor and platelets is crucial for the formation of blood clots and the initiation of the clotting cascade.

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  • 4. 

    ____________ is insoluble, while its precursor ____________ is soluble.

    • Fibrinogen, Fibrin

    • Fibrin, Fibrinogen

    • Thrombin, prothrombin

    • Prothrombin, thrombin

    • None of the above

    Correct Answer
    A. Fibrin, Fibrinogen
    Explanation
    Fibrin is insoluble, while its precursor Fibrinogen is soluble. Fibrinogen is a soluble protein that circulates in the blood plasma, and it is converted into insoluble fibrin during the blood clotting process. Fibrin forms a mesh-like structure that helps in the formation of blood clots to prevent excessive bleeding. This conversion from soluble fibrinogen to insoluble fibrin is a crucial step in the clotting cascade.

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  • 5. 

    Which of the following is a protease responsible for converting fibrinogen to fibrin?

    • Fibrin

    • Thromboxane

    • Thrombin

    • Prothrombin

    • Prostacyclin

    Correct Answer
    A. Thrombin
    Explanation
    Thrombin is a protease responsible for converting fibrinogen to fibrin. It is an enzyme that plays a crucial role in the blood clotting process. Thrombin acts on fibrinogen, a soluble plasma protein, and cleaves it into fibrin monomers. These monomers then polymerize to form a fibrin clot, which helps in the formation of blood clots to prevent excessive bleeding. Thrombin is produced from its precursor, prothrombin, through a series of enzymatic reactions in the coagulation cascade.

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  • 6. 

    Which of the following is the point where extrinsic and intrinsic pathways converge?

    • X

    • Xa

    • IX

    • IXa

    • VIIa

    Correct Answer
    A. Xa
    Explanation
    Xa is the point where the extrinsic and intrinsic pathways converge. Xa is formed through the activation of factor X in both pathways, with the extrinsic pathway being triggered by tissue factor and the intrinsic pathway being triggered by factors within the blood. Once Xa is formed, it goes on to activate factor II (prothrombin) to form thrombin, which then leads to the formation of a blood clot. Therefore, Xa is the common point where both pathways merge and initiate the clotting cascade.

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  • 7. 

    Which of the following is NOT correlated with Factor Xa?

    • Point of convergence between extrinsic pathway and intrinsic pathway

    • Is the activated form of Factors X

    • Inhibition of Factor VII to VIIa

    • Hydrolyzes and activates prothrombin to thrombin

    Correct Answer
    A. Inhibition of Factor VII to VIIa
    Explanation
    Factor Xa is not correlated with the inhibition of Factor VII to VIIa. Factor Xa is a key component in the coagulation cascade and is involved in the activation of prothrombin to thrombin. It is also the activated form of Factors X. However, Factor VII to VIIa is not directly related to Factor Xa. Therefore, the inhibition of Factor VII to VIIa does not correlate with Factor Xa.

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  • 8. 

    Which of the following is NOT part of the tenase complex?

    • Ca2+

    • Factor VIIIa

    • Factor IXa

    • Factor X

    • Factor VIIa

    Correct Answer
    A. Factor VIIa
    Explanation
    The tenase complex is a key component of the coagulation cascade and is responsible for activating factor X. It consists of factor VIIIa, factor IXa, and calcium ions (Ca2+). Factor VIIa, on the other hand, is part of the extrinsic pathway and forms the tissue factor-factor VIIa complex. Therefore, factor VIIa is not part of the tenase complex.

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  • 9. 

    Which of the following initiates the extrinsic pathway of the clotting cascade?

    • Factor III (Tissue Factor)

    • Factor VII

    • Factor VIII

    • Factor IX

    • Factor X

    Correct Answer
    A. Factor III (Tissue Factor)
    Explanation
    Factor III, also known as Tissue Factor, initiates the extrinsic pathway of the clotting cascade. This pathway is activated when there is tissue damage, and Factor III is released from damaged tissue. It then forms a complex with Factor VII, which leads to the activation of Factor X and ultimately the formation of a blood clot. Factors VIII and IX are part of the intrinsic pathway, while Factor X is a common pathway factor that is activated by both the extrinsic and intrinsic pathways.

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  • 10. 

    Factor II is known as _____________, while Factor IIa is known as __________.

    • Fibrinogen, Fibrin

    • Fibrin, Fibrinogen

    • Thrombin, prothrombin

    • Prothrombin, thrombin

    • None of the above

    Correct Answer
    A. Prothrombin, thrombin
    Explanation
    Factor II is known as prothrombin, while Factor IIa is known as thrombin. Prothrombin is an inactive precursor protein that is converted into active thrombin through a series of enzymatic reactions. Thrombin plays a crucial role in the coagulation cascade by converting fibrinogen into fibrin, which forms a clot to stop bleeding. Therefore, the correct answer is Prothrombin, thrombin.

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  • 11. 

    Which of the following is NOT inhibited by heparin?

    • Factor XIIa

    • Factor XIa

    • Factor IXa

    • Factor Xa

    • Thrombin

    • Fibrin

    Correct Answer
    A. Fibrin
    Explanation
    Heparin is a medication that inhibits blood clotting. It works by preventing the formation of fibrin, a protein that forms the mesh-like structure of blood clots. Therefore, heparin does not inhibit fibrin, making it the correct answer in this case. Factors XIIa, XIa, IXa, and Xa are all enzymes involved in the blood clotting cascade, and heparin can inhibit their activity. Thrombin is also inhibited by heparin, as it plays a crucial role in converting fibrinogen to fibrin.

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  • 12. 

    Which of the following is NOT an inhibitor of thrombin?

    • Heparin

    • Alpha2-macroglobulin

    • Alpha1-antitrypsin

    • Heparin cofactor II

    • All are inhibitors of thrombin

    Correct Answer
    A. All are inhibitors of thrombin
    Explanation
    All of the options listed in the question are inhibitors of thrombin. Heparin is a widely used anticoagulant that inhibits thrombin by binding to antithrombin III and enhancing its activity. Alpha2-macroglobulin is a protease inhibitor that can also inhibit thrombin. Alpha1-antitrypsin is a serine protease inhibitor that can inhibit thrombin as well. Heparin cofactor II is a protein that specifically inhibits thrombin by binding to it and preventing its activity. Therefore, the correct answer is that all of the options listed are inhibitors of thrombin.

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  • 13. 

    Which of the following is primarily responsible for degradation of fibrin clots?

    • Plasmin

    • Plasminogen

    • Thrombin

    • Prothrombin

    • Factor III

    Correct Answer
    A. Plasmin
    Explanation
    Plasmin is primarily responsible for the degradation of fibrin clots. Plasmin is an enzyme that breaks down fibrin, the protein responsible for clot formation. It is derived from plasminogen, which is activated by tissue plasminogen activator (tPA) or urokinase-type plasminogen activator (uPA). Once activated, plasmin cleaves fibrin into smaller fragments, leading to clot dissolution. Thrombin and prothrombin are involved in the clot formation process, while Factor III (also known as tissue factor) is a protein that initiates the clotting cascade.

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  • 14. 

    Hemophilia A is classic hemophilia. It is a disease referring to the inability to clot blood. Which of the following is deficient in this X-linked recessive disorder?

    • Factor VII

    • Factor VIII

    • Factor IX

    • Factor X

    • Factor Xa

    Correct Answer
    A. Factor VIII
    Explanation
    Hemophilia A is a disease characterized by the inability to clot blood. It is an X-linked recessive disorder, meaning it is caused by a mutation on the X chromosome. The correct answer is Factor VIII because in Hemophilia A, there is a deficiency or absence of this clotting factor. Factor VIII plays a crucial role in the clotting cascade, helping to form a stable blood clot. Without enough Factor VIII, individuals with Hemophilia A experience prolonged bleeding and are at risk for excessive bleeding even from minor injuries.

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  • 15. 

    Hemophilia B results from a deficiency of which clotting factor?

    • Factor VII

    • Factor VIII

    • Factor IX

    • Factor X

    • Factor XIII

    Correct Answer
    A. Factor IX
    Explanation
    Hemophilia B is a genetic disorder that occurs due to a deficiency of a specific clotting factor. In this case, the correct answer is Factor IX. This clotting factor plays a crucial role in the blood clotting process, specifically in the formation of fibrin, which helps in stopping bleeding. A deficiency of Factor IX leads to impaired blood clotting and excessive bleeding, which is characteristic of Hemophilia B.

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  • 16. 

    Von Willebrand Disease (vWD) is due to an inherited deficiency in von Willebrand Factor (vWF). Which of the following factors are also affected as a result of deficiency of vWF?

    • Factor VII

    • Factor VIII

    • Factor IX

    • Factor X

    • Factor Xa

    Correct Answer
    A. Factor VIII
    Explanation
    Von Willebrand Disease (vWD) is caused by a deficiency in von Willebrand Factor (vWF). Factor VIII is also affected as a result of this deficiency. Von Willebrand Factor plays a crucial role in stabilizing and protecting Factor VIII in the blood, which is necessary for normal blood clotting. Therefore, a deficiency in vWF leads to a decrease in the levels and function of Factor VIII, contributing to the bleeding tendencies observed in vWD patients.

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  • 17. 

    Which of the following is heparin treatment MOST correlated to?

    • Hemophilia A

    • Hemophila B

    • Disorders of fibrinogen and Factor XIII

    • Von Willebrand Disease

    • Factor XI and Contact Activation

    • Antithrombin deficiency

    Correct Answer
    A. Antithrombin deficiency
    Explanation
    Heparin treatment is most correlated to Antithrombin deficiency. Heparin is a medication that works by enhancing the activity of antithrombin, a natural anticoagulant in the body. Antithrombin deficiency is a condition where there is a lack of this anticoagulant, leading to an increased risk of blood clot formation. Heparin is commonly used to prevent and treat blood clots in individuals with antithrombin deficiency.

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  • 18. 

    Calcium is the trivial name for which of the following factors?

    • Factor I

    • Factor II

    • Factor III

    • Factor IV

    • Factor V

    Correct Answer
    A. Factor IV
    Explanation
    Calcium is the trivial name for Factor IV.

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  • 19. 

    Which of the following inactivates the extrinsic pathway?

    • Lipoprotein associated coagulation inhibitor

    • Thrombin

    • Prothrombin

    • fibrin

    • Fibrinogen

    Correct Answer
    A. Lipoprotein associated coagulation inhibitor
    Explanation
    The lipoprotein associated coagulation inhibitor is the correct answer because it is known to inactivate the extrinsic pathway of coagulation. This inhibitor plays a crucial role in regulating blood clotting by inhibiting the activity of tissue factor pathway inhibitor (TFPI), which is involved in the extrinsic pathway. By inhibiting TFPI, the lipoprotein associated coagulation inhibitor prevents the activation of factor X and subsequent clot formation through the extrinsic pathway.

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  • 20. 

    Which of the following works with thrombin in aiding the degradation of clotting factors?

    • Thrombomodulin

    • Protein C

    • Protein S

    • All of the above

    • None of the above

    Correct Answer
    A. All of the above
    Explanation
    Thrombomodulin, Protein C, and Protein S all work with thrombin in aiding the degradation of clotting factors. Thrombomodulin is a protein that binds to thrombin and changes its function, leading to the activation of Protein C. Protein C then binds to Protein S, and together they form a complex that degrades clotting factors, such as Factors Va and VIIIa. Therefore, all of the options listed (Thrombomodulin, Protein C, and Protein S) work together in aiding the degradation of clotting factors.

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  • 21. 

    Which of the following is PRIMARILY responsible for formation of fibrin polymers?

    • Factor VIIIa

    • Factor IXa

    • Factor Xa

    • Factor XIIa

    • Factor XIIIa

    Correct Answer
    A. Factor XIIIa
    Explanation
    factor 13a forms covalent crosslinks between fibrin dimers

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  • 22. 

    Which of the following is NOT calcium dependent?

    • Factor II

    • Factor III

    • Factor VII

    • Factor IX

    • Factor X

    Correct Answer
    A. Factor III
    Explanation
    Factor III, also known as tissue factor, is NOT calcium dependent. Tissue factor is a transmembrane protein that initiates the extrinsic pathway of blood coagulation. Unlike other clotting factors, Factor III does not require calcium ions for its activation. Instead, it forms a complex with Factor VIIa, which then activates Factor X to start the coagulation cascade.

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  • 23. 

    Which of the following is NOT found in the prothrombinase complex?

    • Calcium

    • Factor Xa

    • Disulfide bonds

    • Factor Va

    • Factor VIIIa

    • Phospholipids

    Correct Answer
    A. Factor VIIIa
    Explanation
    Factor VIIIa is not found in the prothrombinase complex. The prothrombinase complex is composed of factor Xa, factor Va, and phospholipids, which work together to convert prothrombin to thrombin. Factor VIIIa, on the other hand, is part of the intrinsic pathway of the coagulation cascade and is not directly involved in the formation of the prothrombinase complex.

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  • 24. 

    Prothrombin is cleaved to form a 2-chain active thrombin molecule, a serine protease, that will cleave fibrinogen to form fibrin. The short chain of the active thrombin molecule is the ____ chain.

    • A

    • B

    • C

    • D

    • E

    Correct Answer
    A. A
    Explanation
    Prothrombin is cleaved to form a 2-chain active thrombin molecule, with one long chain and one short chain. The short chain of the active thrombin molecule is referred to as the A chain.

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  • 25. 

    Thrombin combines with _________ present on endothelial cell surfaces forming a complex that converts protein C to protein Ca.

    • Protein S

    • Factor Va

    • Thrombomodulin

    • Factor VIIa

    • Protein C

    Correct Answer
    A. Thrombomodulin
    Explanation
    Thrombomodulin is the correct answer because it is the protein present on endothelial cell surfaces that forms a complex with thrombin. This complex then converts protein C to protein Ca. Protein S, Factor Va, Factor VIIa, and Protein C are not directly involved in this process.

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  • 26. 

    Which of the following is characterized by easy bruising and prolonged bleeding?

    • Hemophilia A

    • Hemophilia B

    • Disorders of Fibrinogen and Factor XIII

    • Von Willebrand Disease

    • Factor XI and Contact Activation

    • Antithrombin deficiency

    Correct Answer
    A. Hemophilia A
    Explanation
    Hemophilia A is characterized by easy bruising and prolonged bleeding because it is a genetic disorder that affects the blood's ability to clot. It is caused by a deficiency or absence of clotting factor VIII, which is necessary for the formation of blood clots. Without enough factor VIII, the blood cannot clot properly, leading to easy bruising and prolonged bleeding.

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  • 27. 

     Which of the following involves the transglutaminase reaction?

    • Factor VIII

    • Factor XIII

    • Factor X

    • Factor IX

    • Factor II

    Correct Answer
    A. Factor XIII
    Explanation
    Factor XIII is the correct answer because it is involved in the transglutaminase reaction. Transglutaminase is an enzyme that catalyzes the formation of covalent bonds between proteins. Factor XIII is a clotting factor in the blood that plays a role in stabilizing blood clots by cross-linking fibrin. This cross-linking process is mediated by the transglutaminase activity of Factor XIII.

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  • 28. 

    Which of the following is characterized by prolonged coagulation time?

    • Hemophilia A

    • Hemophilia B

    • Disorders of Fibrinogen and Factor XIII

    • Von Willebrand Disease

    • Factor XI and Contact Activation

    • Antithrombin deficiency

    Correct Answer
    A. Hemophilia B
    Explanation
    Hemophilia B is characterized by prolonged coagulation time. Hemophilia B is a genetic disorder caused by a deficiency in clotting factor IX, which is necessary for the blood to clot properly. Without enough factor IX, the coagulation process is impaired, leading to prolonged bleeding.

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  • 29. 

    Which of the following is also seen in women on oral contraceptives?

    • Hemophilia A

    • Hemophilia B

    • Disorders of Fibrinogen and Factor XIII

    • Von Willebrand Disease

    • Factor XI and Contact Activation

    • Antithrombin deficiency

    Correct Answer
    A. Disorders of Fibrinogen and Factor XIII
    Explanation
    Women on oral contraceptives may also experience disorders of fibrinogen and factor XIII. This is because oral contraceptives can alter the levels of certain clotting factors in the blood, including fibrinogen and factor XIII. These alterations can increase the risk of abnormal blood clotting or bleeding disorders in some women.

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  • 30. 

    Which of the following is the most commonly inherited bleeding disorder in humans?

    • Hemophilia A

    • Hemophilia B

    • Disorders of Fibrinogen and Factor XIII

    • Von Willebrand Disease

    • Factor XI and Contact Activation

    • Antithrombin deficiency

    Correct Answer
    A. Von Willebrand Disease
    Explanation
    Von Willebrand Disease is the most commonly inherited bleeding disorder in humans. It is caused by a deficiency or dysfunction of von Willebrand factor (VWF), a protein involved in blood clotting. This disorder can result in prolonged bleeding and easy bruising. Hemophilia A and Hemophilia B are also inherited bleeding disorders, but they are less common than Von Willebrand Disease. Disorders of Fibrinogen and Factor XIII, Factor XI and Contact Activation, and Antithrombin deficiency are all other types of bleeding disorders, but they are not as commonly inherited as Von Willebrand Disease.

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  • 31. 

    Which of the following is common in Ashkenazic Jews?

    • Hemophilia A

    • Hemophilia B

    • Disorders of Fibrinogen and Factor XIII

    • Von Willebrand Disease

    • Factor XI and Contact Activation

    • Antithrombin deficiency

    Correct Answer
    A. Factor XI and Contact Activation
    Explanation
    Factor XI deficiency is a common disorder in Ashkenazic Jews. This is a hereditary bleeding disorder that affects the blood's ability to clot properly. Contact activation refers to the process by which the blood clotting cascade is initiated, and factor XI plays a crucial role in this process. Therefore, it is common for Ashkenazic Jews to have a deficiency in factor XI and abnormal contact activation, leading to a higher risk of bleeding and clotting disorders.

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  • 32. 

    Which of the following inhibits thrombin as well as Factors IXa, Xa, XIa, and XIIa?

    • Antithrombin III

    • Heparin

    • Thrombomodulin

    • Calcium

    Correct Answer
    A. Antithrombin III
    Explanation
    Antithrombin III is the correct answer because it is a natural anticoagulant that inhibits the activity of thrombin as well as several other clotting factors including Factors IXa, Xa, XIa, and XIIa. It works by binding to these factors and preventing their activation, thereby preventing the formation of blood clots. Heparin, another option, also inhibits thrombin and some of these clotting factors, but it does so indirectly by enhancing the activity of antithrombin III. Thrombomodulin is a protein that helps activate protein C, which in turn inhibits thrombin. Calcium, on the other hand, is not directly involved in inhibiting these clotting factors.

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  • 33. 

    Vitamin ___ is responsible for the ___________ of coagulation factors.

    • C, carboxylation

    • C, decarboxylation

    • K, carboxylation

    • K, decarboxylation

    Correct Answer
    A. K, carboxylation
    Explanation
    Vitamin K is responsible for the carboxylation of coagulation factors. Carboxylation is a process that adds a carboxyl group to a molecule, and in this case, it is necessary for the activation of coagulation factors. Vitamin K plays a crucial role in blood clotting by helping to convert inactive coagulation factors into their active forms.

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  • 34. 

    Warfarin is a common anticoagulant. What is its mode of action?

    • Competitive inhibition of Vitamin K

    • Decarboxylation of clotting factors

    • Inhibitor of thrombin

    • Stabilizes fibrinogen and prevents its conversion to fibrin

    • Conversion of Vitamin K epoxide to the quinone form

    Correct Answer
    A. Competitive inhibition of Vitamin K
    Explanation
    Warfarin acts by competitively inhibiting Vitamin K, which is essential for the activation of clotting factors in the body. By inhibiting Vitamin K, warfarin reduces the production of active clotting factors, thus preventing the formation of blood clots. This mode of action makes warfarin an effective anticoagulant medication.

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  • 35. 

    Rodenticides employ coumarin-type drugs such as warfarin to induce death by internal hemorrhaging. Which of the following enzymes are inhibited by these drugs?

    • Vitamin K reductase

    • Carboxylase-epoxidase

    • Epoxide reductase

    Correct Answer
    A. Epoxide reductase
    Explanation
    Warfarin, a coumarin-type drug, inhibits the enzyme Epoxide reductase. This enzyme is responsible for the conversion of vitamin K epoxide back to its active form, vitamin K hydroquinone, which is essential for the synthesis of clotting factors. By inhibiting epoxide reductase, warfarin interferes with the recycling of vitamin K and disrupts the normal clotting process, leading to internal hemorrhaging and ultimately death.

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  • 36. 

    The prothrombin time test is used to measure clotting factors found in which pathway besides the common pathway?

    • Intrinsic

    • Extrinsic

    Correct Answer
    A. Extrinsic
    Explanation
    The prothrombin time test is used to measure clotting factors found in the extrinsic pathway besides the common pathway. The extrinsic pathway is one of the two pathways involved in blood clotting, the other being the intrinsic pathway. The extrinsic pathway is activated by tissue factor (TF) released from damaged blood vessels, while the intrinsic pathway is activated by factors within the blood. Therefore, the prothrombin time test specifically measures the clotting factors in the extrinsic pathway to assess the overall clotting function of an individual.

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  • 37. 

    The activated partial thromboplastin time test is used to measure clotting factors found in which pathway besides the common pathway?

    • Intrinsic

    • Extrinsic

    Correct Answer
    A. Intrinsic
    Explanation
    The activated partial thromboplastin time (aPTT) test is a laboratory test used to evaluate the clotting factors in the blood. It measures the time it takes for a clot to form in the intrinsic pathway of the coagulation cascade. The intrinsic pathway is one of the two main pathways involved in blood clotting, the other being the extrinsic pathway. The aPTT test specifically assesses the clotting factors in the intrinsic pathway, which includes factors VIII, IX, XI, and XII. Therefore, the correct answer is intrinsic.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
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  • Oct 21, 2011
    Quiz Created by
    Chachelly

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