Describe the role of plasmin.
Converts fibrinogen to fibrin, allowing the formation of a clot
Breaks down fibrin, dissolving the clot
Triggers the extrinsic clotting mechanism, leading to clot formation
Inactivates thrombin, slowing clot formation
The Correct Answer is B
A. Converts fibrinogen to fibrin: that reaction is carried out by thrombin, not plasmin.
B. Breaks down fibrin, dissolving the clot: plasmin is the primary enzyme of fibrinolysis, cleaving fibrin to dissolve formed clots.
C. Triggers the extrinsic clotting mechanism, leading to clot formation: the extrinsic pathway is initiated by tissue factor (factor III) interacting with factor VII, not plasmin.
D. Inactivates thrombin, slowing clot formation: plasmin’s main role is fibrin breakdown; thrombin is primarily regulated by antithrombin, thrombomodulin–protein C systems. (Plasmin can degrade some clotting proteins but it is not described as the main inactivator of thrombin.)
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Their epithelial lining changes to connective tissue. -The lining transitions from pseudostratified ciliated columnar to cuboidal to simple squamous, but never connective tissue.
B. Their epithelial lining becomes thinner. -This thinning allows efficient gas exchange at the alveolar level.
C. They have relatively thicker epithelial lining. -The epithelium actually becomes progressively thinner.
D. They have relatively more cartilage. -Cartilage decreases as bronchi branch into bronchioles, disappearing entirely in terminal bronchioles.
Correct Answer is A
Explanation
A. Diapedesis (transmigration): the cell is shown squeezing through the vessel wall (leaving the bloodstream), which is diapedesis (also called extravasation).
B. Phagocytosis: phagocytosis is ingestion of particles/pathogens by a phagocyte; the image shows movement out of a vessel, not engulfment of material.
C. Chemotaxis: Incorrect (related but not the pictured action) -chemotaxis is directed movement toward chemical signals; a leukocyte may chemotax once in the tissue, but the image specifically shows the mechanical passage through the endothelium (diapedesis).
D. Margination/Rolling: margination/rolling are earlier steps along the endothelium where leukocytes slow and adhere; the image shows a cell already squeezing through the wall, which is the next step (diapedesis).
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