According to Biology, Sneezing is an involuntary reflex action.It occurs when the nerve endings of the mucous membrane of the nose get irritated. This irritation can occur due to the swelling of the mucous membrane. This happens when we get cold. This also occurs due to the foreign bodies that somehow manage to enter into the nose. Again, even allergies produce irritation. The act of sneezing is an attempt by the body to expel air to get rid of irritating bodies. Sometimes, sneezing also occurs when the optic nerve is stimulated by a bright light. During the act of sneezing, our whole body gets a jerk because the air comes out with the great speed- about 160 km per hour. The whole body vibrates and the eyes automatically gets closed. In fact, we cannot keep our eyes open during sneezing even if we try to do so.
(source : Children's Knowledge Bank, volume II, Topic: Human Body, page :92, 2nd para)
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(source : Children's Knowledge Bank, volume II, Topic: Human Body, page :92, 2nd para)
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