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Coast to coast, Body temperature returns to 37°C - Coggle Diagram

- - - - Heat-promoting centre of hypothalamus is activated
        
        The thyroid gland releases hormones to increase metabolic rate, , therefore, energy is produced faster and more heat is produced as a by-product.
        
        Blood vessels near surface contrict (vasoconstriction) to reduce heat lost through skin surface.
        
        Skeletal muscels contract rapidly, producing heat at around 15kJ/minute but consuming large amounts of emergy/oxygen
    - - Heat-loss centre of hypothalamus is activated
        
        Sweat glands are activated and sweat on the skin cools the body via evapouration.
        Hair erector muscles relax, causing hairs to lie flat against the skin and reducing their insulating effect.
        
        Blood vessels close to the skin dilate (vasodilation) and, due to the large surface area of the skin, warm blood from the core of the body is quickly cooled