Sneezing is an ancient biological reflex that serves as an emergency air-clearing mechanism for the respiratory system. It is triggered by irritants detected by nasal receptors, which signal the brainstem to coordinate a rapid, full-body response including a deep inhalation and explosive expulsion of air. While primarily aimed at ejecting irritants, newer hypotheses suggest sneezing may also help redistribute mucus to enhance immune defenses. AI
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RANK_REASON The article discusses a biological function and cites scientific reviews, fitting the 'commentary' bucket for expert explanation.
