MCAT Biology Question 90: Answer and Explanation
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Question: 90
15. Allergic reactions occur due to an overactive immune response to a substance. Which cells within the respiratory tract play the largest role in the generation of allergic reactions?
- A. Alveolar epithelial cells
- B. Macrophages
- C. Mast cells
- D. Ciliated epithelial cells
Correct Answer: C
Explanation:
Allergic reactions occur when a substance binds to an antibody and promotes an overactive immune response with inflammatory chemicals. The antibody is already attached to a mast cell. Thus, when the substance binds to the antibody, the mast cell can release the inflammatory mediators that cause allergic reactions.