On wound __________ fight foreign particles, like bacteria?
Correct answer: A. White Blood cells
- A. White Blood cells
- B. Red Blood Cells
- C. Platelets
- D. Plasma
Explanation
White blood cells defend a wound by recognizing, engulfing, or destroying invading bacteria and by coordinating immune responses. Students may choose platelets because they act at wounds, but platelets mainly form clots and do not provide the principal cellular defence against bacteria.
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About Specific Defense Mechanism
Specific defense mechanisms provide targeted immunity through B lymphocytes, T lymphocytes, antibodies and memory cells that recognize particular antigens. Questions cover humoral and cell mediated responses, clonal selection, primary and secondary immune responses, vaccination and passive immunity, while distinguishing adaptive defenses from the immediate, non specific innate response.
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