![]() ![]() If heat loss is severe, the brain triggers an increase in random signals to skeletal muscles, causing them to contract and producing shivering. This arrangement traps heat closer to the body core and restricts heat loss. In contrast, activation of the brain’s heat-gain center by exposure to cold reduces blood flow to the skin, and blood returning from the limbs is diverted into a network of deep veins. This further increases heat loss from the lungs.
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