Thermoregulation is the process that enables the human body to maintain its core temperature regardless of the external temperature. The hypothalamus is the part of the brain that ensures that the internal body temperature is kept between 97.7 to 99.5 degrees Fahrenheit.
The human body regulates temperature by balancing the amount of heat lost and gained. Thermoregulation is important because the cells in the body need a specific temperature to work properly. The human body uses temperature receptors located throughout the body to make physiological adjustments and maintain a constant core temperature. The skin controls the temperature of the body and protects the internal organs from external conditions. For instance, when a person is in a hot environment, the blood vessels widen to release sweat through the pores and cool the body. When the surroundings are cold, the blood vessels constrict to reduce the flow of blood to the surface in order to trap air near the skin's surface and warm the body. According to Healthline, if the body temperature falls just 3 degrees to 95 F (35 C), a person might experience hypothermia, which can cause cardiac arrest, stroke, or even death. At 107.6 F (42 C), a person could suffer brain damage because of temperatures that are too high.