A sneeze, or sternutation, is a semi-autonomous, convulsive expulsion of air from the lungs through the nose and mouth, usually caused by foreign particles irritating the nasal mucosa membraneA sneeze, or sternutation, is a semi-autonomous, convulsive expulsion of air from the lungs through the nose and mouth, usually caused by foreign particles irritating the nasal mucosa membrane (Encyclopedia Britannica, 2015). A sneeze expels air forcibly from the mouth and nose in an explosive, spasmodic involuntary action which allows for mucus to escape through the nasal cavity, cleansing it of foreign particles or irritants (Encyclopedia Britannica, 2015)..
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