If a patient's asthma is triggered by pollen exposure, causing airway inflammation and bronchospasm, which mechanism explains the immediate increase in airway resistance?

💡 Explanation

Mast cell degranulation is the mechanism because, upon pollen exposure, mast cells release histamine and leukotrienes, leading to smooth muscle contraction and increased airway resistance. Therefore, option B is correct, rather than alveolar tension, vasoconstriction, or goblet cell-driven mechanisms being primary.

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