Questions about goosebumps?!

People feel the cold or afraid, will soon tighten the skin pores, the formation of the people commonly known as goose bumps. Some animals, too, such as cock fights will in parts of the feathers ruffled neck, both means of demonstration, is the reason due to nervousness. What causes this phenomenon it? Japan's Kitajima Yasuo skin experts said the goose bumps are certain constant temperature to preserve animals and specific physiological phenomena. When the brain senses the cold, tension or terror, tension and excitement generated when the work of the sympathetic role of the legislative body hair hair affects muscle contraction, resulting in goose bumps appear. Li Mao tendons in the body near the hair root, it is a contraction, usually sideways to the erection of body hair up and hair roots of the surrounding bulge, forming the same skin as the birds, Gegedada shape. Goose bumps, in addition to muscle contractions produce heat, the closed pores also the effect of cold. Erect body hair body hair long after the animals, body hair, the gap between the insulation benefit.