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.
Causes of Sneezing in Cats. Most cases of cat sneezing are caused by upper respiratory infections. Very young and very old cats are most vulnerable to such infections. The most common cause of sneezing in cats is the feline herpes virus, which causes upper respiratory symptoms including sneezing and nasal discharge.