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 A
Explanation
A. The AV valves are closing: This occurs at S₁ (first heart sound) at the start of ventricular systole.
B. The semilunar valves are closing: Semilunar valves close at S₂ (second heart sound), not S₁.
C. The AV valves are opening: AV valves open during ventricular diastole (filling), not at S₁.
D. The semilunar valves are opening: Semilunar valves open during ventricular ejection (systole) but their opening is not what produces S₁.
Correct Answer is A
Explanation
A. Large intestine: haustra are sac-like pouches formed by taeniae coli in the large intestine (colon).
B. Pancreas: the pancreas is a glandular organ and does not have haustra.
C. Small intestine: the small intestine has plicae circulares and villi, not haustra.
D. Stomach: the stomach has rugae (folds) but not haustra.
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