- body temperature is monitored and controlled by the thermoregulatory centre in your brain, the thermoregulatory centre contains receptors sensitive to the temperature of the blood
- the skin also contains temperature receptors and sends nerve impluses to the thermoregulatory centre
- if the body temperature is too high, blood vessels dilate (vasodilation) and sweat is produced from the sweat glands, both cause a transfer of energy from the skin to the environment
- if the body temperature is too low, then the blood vessels constrict (vasoconstriction) and sweating stops, reducing the transfer of energy to the environment
- skeletal muscles contract (shiver) and the exothermic reactions of respiration needed for muscle contraction raise the temperature
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