Alopecia areata is an autoimmune disease. This means that your immune system mistakenly attacks a part of your body. When you have alopecia areata, cells in your immune system surround and attack your hair follicles (the part of your body that makes hair).
C.) Digestion is not increased during the "fight-or-flight" sympathetic nerve response. It actually increases as a result of the parasympathetic nerve system response.
