This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.
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The sneeze reflex, or sternutation, is a powerful, involuntary expulsion of air from the lungs through the nose and mouth. It's a reflex designed to clear the nasal passages of irritants. Step 1: Irritants like dust, pollen, or strong smells stimulate nerve endings in the nasal mucosa. Step 2: These signals travel via the trigeminal nerve to the sneeze center in the brainstem. Step 3: The brainstem coordinates a complex sequence: a deep inhalation, followed by the forceful closure of the glottis and soft palate. Step 4: The glottis then suddenly opens, and abdominal and chest muscles contract forcefully, expelling air at high speed through the nose and mouth, carrying irritants with it. What's next?