Histamine released by mast cells at a wound causes
Correct answer: A. vasodilation and increased capillary permeability, producing inflammation
- A. vasodilation and increased capillary permeability, producing inflammation
- B. clotting of the lymph
- C. a fall in body temperature
- D. immediate antibody production
Explanation
Histamine opens the local vessels so plasma and phagocytes reach the injured site, causing the redness, heat and swelling of inflammation. This chemical alarm is part of the rapid non specific response.
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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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