A type of immediately occuring reaction in which antigens combine with antibodies already attached to the surface of mast cells and basophils is called_____________?
Correct answer: A. Type I hypersensitivity
- A. Type I hypersensitivity
- B. Type II hypersensitivity
- C. Type III hypersensitivity
- D. Type IV hypersensitivity
Explanation
Type I hypersensitivity is an immediate, IgE-mediated reaction: antigen cross-links IgE already fixed to mast cells and basophils, causing mediator release. Types II and III involve antibodies against cells or deposited immune complexes, while type IV is T-cell mediated.
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