MARTIN DOHRN / SCIENCE PHOTO LIBRARY MARTIN DOHRN / SCIENCE PHOTO LIBRARY
Close-up of the human forearm showing goose bumps (medical name: cutis anserina), a reaction of the skin to cold or fear. Blood vessels in the area contract as do the small muscles attached to the base of each hair follicle, pulling the hair into an upright position. In this position the skin resembles plucked goose skin.
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