Which of the following cells function as phagocytes?
Macrophages
Lymphocytes
Erythrocytes
Mast cells
The Correct Answer is A
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Increased blood pH: increased pH (alkalosis) shifts the oxyhemoglobin curve left, increasing Hb–O₂ affinity and decreasing O₂ release.
B. Decreased body temperature: lower temperature shifts the curve left (higher affinity), reducing O₂ release.
C. Increased blood PCO₂: higher PCO₂ (and associated lower pH) shifts the curve right (Bohr effect), reducing hemoglobin affinity and increasing O₂ release to tissues.
D. Decreased blood PCO₂: lower PCO₂ shifts the curve left, increasing affinity and decreasing O₂ release.
Correct Answer is {"dropdown-group-1":"A"}
Explanation
Correct answer: Neutrophil
Neutrophils have a multilobed (3–5 lobes) nucleus and fine, pale cytoplasmic granules; they are the most abundant WBC and are primary phagocytes in acute bacterial inflammation - those morphological features identify the cell as a neutrophil.
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