Which of the following might be injected into a patient who is prone to forming blood clots and therefore at heart attack or stroke?
Thromboplastin
Fibrinogen
Fibrin
Factor X
Heparin
The Correct Answer is E
A. Thromboplastin: Thromboplastin (tissue factor) initiates the extrinsic coagulation cascade and promotes clot formation; injecting it would increase clotting, not prevent heart attack or stroke.
B. Fibrinogen: Fibrinogen is the soluble precursor that is converted to fibrin during clot formation; giving fibrinogen would support clot formation, not reduce it.
C. Fibrin: Fibrin is the insoluble protein that forms the mesh of a clot; injecting fibrin would directly contribute to clotting.
D. Factor X: Factor X is a key coagulation factor (when activated to Xa it drives thrombin formation); administering it would promote coagulation rather than prevent it.
E. Heparin: Heparin is an anticoagulant that enhances antithrombin activity and reduces clot formation; it is used to prevent or treat thrombosis and reduce risk of heart attack/stroke.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. AB, Rh-negative: AB RBCs carry both A and B antigens, so they cannot serve as universal RBC donors (but AB plasma is often considered a universal plasma donor).
B. O, Rh-negative: O negative RBCs lack A, B, and Rh (D) antigens, so they are the universal donor for red blood cell transfusions.
C. AB, Rh-positive: AB positive RBCs have A, B, and Rh antigens and therefore are not universal RBC donors.
D. O, Rh-positive: O positive RBCs lack A and B antigens but express Rh (D) antigen, so they can’t be given safely to Rh-negative recipients; therefore they are not fully universal donors.
Correct Answer is C
Explanation
A. Granulocytes: granulocytes (neutrophils, eosinophils, basophils) are white blood cells that are part of the buffy coat.
B. Lymphocytes: lymphocytes (T cells, B cells, NK cells) are white blood cells found in the buffy coat.
C. Erythrocytes: erythrocytes (red blood cells) form the red cell layer below the buffy coat; the buffy coat contains white cells and platelets, not RBCs.
D. Agranulocytes: agranulocytes (lymphocytes and monocytes) are included in the buffy coat.
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