Identify the organ marked by an X in the image below. Fill in the blank
The Correct Answer is {"dropdown-group-1":"B"}
Correct answer: Esophagus
The esophagus is the muscular alimentary tube that runs posterior to the trachea from the pharynx to the stomach; a tube positioned behind the heart/sternum on the model marked X corresponds to the esophagus.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
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.)
Correct Answer is A
Explanation
A. Macrophages: macrophages are professional phagocytes that engulf pathogens, debris, and dead cells.
B. Lymphocytes: lymphocytes mainly provide adaptive immune responses (antibody production, cell-mediated cytotoxicity), not primary phagocytosis.
C. Erythrocytes: red blood cells transport oxygen and do not phagocytose.
D. Mast cells: mast cells release histamine and inflammatory mediators; they are not primary phagocytes.
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