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Hives, allergic asthma, and allergic rhinitis may occur during the ____ phase of acute hypersensitivity.

-activation
-effector
-sensitization

User Bokov
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Final answer:

The effector phase of an acute hypersensitivity reaction is when symptoms such as hives, allergic asthma, and allergic rhinitis appear following mast cell degranulation triggered by allergen-specific IgE.

Step-by-step explanation:

Hives, allergic asthma, and allergic rhinitis are symptoms that may occur during the effector phase of an acute hypersensitivity reaction. After the initial sensitization phase, which involves the production of allergen-specific IgE and its binding to mast cell surfaces, subsequent exposure to the allergen leads to mast cell degranulation. This mast cell degranulation, initiated by the crosslinking of allergen-specific IgE, occurs rapidly within minutes, releasing various inflammatory mediators, such as histamine, which contribute to the symptoms associated with immediate hypersensitivity reactions like swelling, redness, coughing, and nasal discharge.

User Stemm
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