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.
Why Spit-Up Happens. After your baby swallows milk, it glides past the back of his throat and goes down a muscular tube, called the esophagus, to the stomach. There is a ring of muscles connecting the esophagus and stomach. It opens to let the milk go into the stomach, and then it closes back up.hy Spit-Up Happens. After your baby swallows milk, it glides past the back of his throat and goes down a muscular tube, called the esophagus, to the stomach. There is a ring of muscles connecting the esophagus and stomach. It opens to let the milk go into the stomach, and then it closes back up.