Body temperature falls during cold days., Cold receptors under the skin detect coldness and trigger impulses to the brain., Nerve impulses from the brain stimulate skin to decrease heat loss., Sweat glands are less active so less sweat produced. Heat can be retained to bring back normal body temperature., Blood vessel constrict so less blood flows near the skin's surface. Less heat is radiated to the environment., Hairs stand erect so thicker layer of air is trapped. Thus, less heat released to the surrounding..

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