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.
sneeze-a symptom consisting of the involuntary expulsion of air from the nose. sneezing, sternutation. inborn reflex, innate reflex, instinctive reflex, physiological reaction, reflex, reflex action, reflex response, unconditioned reflex-an automatic instinctive unlearned reaction to a stimulus.neeze. 1. to emit air or breath suddenly, forcibly, and audibly through the nose and mouth by involuntary, spasmodic action. 2. sneeze at, Informal. to treat with contempt; scorn: $50,000 is nothing to sneeze at. 3. an act or sound of sneezing.