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.
What triggers one infant 's eczema won't trigger another's. Still, there are some common eczema triggers to avoid, including: 1  Dry skin. 2  This is often caused by low humidity, especially during winter when homes are well-heated and the air is dry.3  Dry skin can make a baby's eczema more itchy.4  Irritants.hat triggers one infant 's eczema won't trigger another's. Still, there are some common eczema triggers to avoid, including: 1  Dry skin. 2  This is often caused by low humidity, especially during winter when homes are well-heated and the air is dry.