Because of the chemical nature of impulse and the axon-dendrite structure. Because of the chemical nature of impulse and the axon-dendrite structure. http://www.biologymad.com/nervoussystem/nerveimpulses.htm (Best technical explanation and excellent graphics and animations)
Newborns may sneeze, and this is typically attributed to the irritation of their nasal passages. The most common irritants, explains Dr. Iannelli, are smoke (and simply smoking outside is not enough), animal dander from pets in the house, dust mites, and mold.
Sneezing is caused by an irritation to the nasal lining or the throat. Usually, sneezing is the result of dust or an allergen entering the nose. While sneezing is often annoying, it is usually not serious.It may occur as part of an allergic reaction or may accompany an infection or illness.Sneezing may also result from a drug interaction, direct stimulation of the nose, such as by a nasal spray or touching of nasal mucosa, or from some other irritant.hile sneezing is often annoying, it is usually not serious. It may occur as part of an allergic reaction or may accompany an infection or illness. Sneezing may also result from a drug interaction, direct stimulation of the nose, such as by a nasal spray or touching of nasal mucosa, or from some other irritant.