Human hair consists of the hair shaft, which projects from the skin's surface, and the root, a soft thickened bulb at the base of the hair embedded in the skin. The root ends in the hair bulb. The hair bulb sits in a sac-like pit in the skin called the follicle, from which the hair grows.
During the sympathetic reaction the blood flow is augmented
to the skeletal muscles and brain. Then the blood flow will diminished to the
bowel which may led to constipation. The person will perspire excessively and
may lead to dehydration which eventually may constrain bowel function.
