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THERMOREGULATION (internal body temperature 35.8°C to 37.5°C),…

- - - - sweat cools the body via evaporation
      - sweating (response)
- - - - blood flow slows, and is prioritised to the core, vital organs
        
        some limbs further away from the vital organs such as toes and fingers can be lost due to frost bite and no blood flow
      - rapid contractions of the skeletal muscles
        
        causes shivering which expends energy to generate heating