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 C
Explanation
A. Bound to the globin portion of hemoglobin: Oxygen binds the heme (iron) portion, not the globin protein chains
B. Dissolved in the plasma: Only a small fraction (~1.5%) of O₂ is dissolved in plasma
C. Bound to the heme portion of hemoglobin: Most O₂ (~98–99%) is carried as oxyhemoglobin bound to heme iron
D. In the form of bicarbonate and water: Bicarbonate transport applies to CO₂, not O₂
Correct Answer is A
Explanation
A. Cellular respiration: Cellular respiration (glycolysis, Krebs cycle, oxidative phosphorylation) produces ATP
B. External respiration: External respiration is gas exchange between lungs and blood, not the ATP-producing biochemical process
C. Ventilation: Ventilation (breathing) moves air in/out of lungs but does not itself synthesize ATP
D. Internal respiration: Internal respiration is gas exchange between blood and tissues, not the intracellular ATP-producing pathways
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