Histamine released by mast cells at a wound causes
- 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.