Which statement regarding basophils best describes their role in hypersensitivity?

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Multiple Choice

Which statement regarding basophils best describes their role in hypersensitivity?

Basophils are key players in immediate allergic (hypersensitivity) reactions. They carry high-affinity IgE receptors, and when an allergen crosses the IgE on their surface, basophils degranulate and release histamine and other mediators. Histamine then drives the classic early symptoms of allergy—vasodilation, increased vascular permeability, itch, and bronchoconstriction—producing the rapid reaction seen in type I hypersensitivity. Mast cells, the tissue counterparts of basophils, do a similar job, but basophils are the circulating source that can contribute to systemic or amplified responses. Eosinophils, while involved in allergic inflammation, are more associated with the later, sustained phase of the reaction and parasite defense rather than the immediate release of histamine. Neutrophils are general first responders in many infections and are not the primary histamine releasers in allergy. Lymphocytes include cells that help drive IgE production and regulation, but they do not release histamine themselves.

Basophils are key players in immediate allergic (hypersensitivity) reactions. They carry high-affinity IgE receptors, and when an allergen crosses the IgE on their surface, basophils degranulate and release histamine and other mediators. Histamine then drives the classic early symptoms of allergy—vasodilation, increased vascular permeability, itch, and bronchoconstriction—producing the rapid reaction seen in type I hypersensitivity. Mast cells, the tissue counterparts of basophils, do a similar job, but basophils are the circulating source that can contribute to systemic or amplified responses.

Eosinophils, while involved in allergic inflammation, are more associated with the later, sustained phase of the reaction and parasite defense rather than the immediate release of histamine. Neutrophils are general first responders in many infections and are not the primary histamine releasers in allergy. Lymphocytes include cells that help drive IgE production and regulation, but they do not release histamine themselves.

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