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How our body maintains a constant temperature. Temperature receptors in the skin detect changes in the external temperature. They pass this information to the processing centre in the brain, called the hypothalamus. The processing centre also has temperature receptors to detect changes in the temperature of the blood.
Similar to how the body reacts to heat during the summer months, the body naturally reacts and attempts to acclimate itself to cold. The most important factor in effectively battling and surviving in the cold is the body's ability to maintain its internal core temperature around 98.6 degrees Fahrenheit.