Final answer:
IgE is the key antibody class that triggers basophils and mast cells in response to allergens and parasites, playing critical roles in defense mechanisms against parasites and allergic reactions.
Explanation:
IgE is the class of antibodies that activates basophils and mast cells in response to allergens and parasites. The Fc region of IgE binds to these cells, leading to the release of pro-inflammatory mediators upon interaction with specific antigens.
This process plays a significant role in defending against parasites but is also central to allergic reactions, making IgE crucial in both scenarios.
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