What is the primary function of lymphocytes?
To produce enzymes that dissolve blood clots.
To act against foreign substances.
To phagocytize damaged cells.
To release substances that initiate blood clots.
The Correct Answer is B
A. To produce enzymes that dissolve blood clots: fibrinolytic enzymes (e.g., plasmin) handle clot breakdown; lymphocytes are not responsible for that.
B. To act against foreign substances: lymphocytes (B cells, T cells, NK cells) are central to adaptive immunity and target pathogens/foreign antigens.
C. To phagocytize damaged cells: phagocytosis is mainly done by macrophages and neutrophils, not lymphocytes.
D. To release substances that initiate blood clots: platelets and clotting factor pathways initiate clotting; lymphocytes do not.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. To produce enzymes that dissolve blood clots: fibrinolytic enzymes (e.g., plasmin) handle clot breakdown; lymphocytes are not responsible for that.
B. To act against foreign substances: lymphocytes (B cells, T cells, NK cells) are central to adaptive immunity and target pathogens/foreign antigens.
C. To phagocytize damaged cells: phagocytosis is mainly done by macrophages and neutrophils, not lymphocytes.
D. To release substances that initiate blood clots: platelets and clotting factor pathways initiate clotting; lymphocytes do not.
Correct Answer is ["A","C"]
Explanation
A. heart: Has atrioventricular (mitral/tricuspid) and semilunar (aortic/pulmonic) valves.
B. arteries: Systemic arteries generally lack valves (the aortic/pulmonic “valves” are cardiac valves at the heart outflow, not within the arterial tree).
C. veins: Especially in limbs; valves prevent backflow and aid venous return.
D. capillaries: Capillaries are single-layer vessels without valves.
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