2.89: Describe the Role of the Skin in Temperature Regulation, with Reference to Sweating, Vasoconstriction and Vasodilation

THERMOREGULATION: Control of an Optimum Temperature for the Body (Allows   

 Enzymes to Work at Optimum Environment)

HOT	COLD
Diagram Showing the Skin in a Hot Environment	Diagram Showing the Skin in a Cold Environment
Hair Erector Muscles will Relax so Skin Hair will Lay Flat on the Skin Vasodilation, Vessels Near the Skin will Dilate to Increase Blood Supply to Surface so Allows More Radiated Heat Loss Sweat Glands will Excrete Sweat for Evaporative Cooling Layer of Fat Prevents Radiated Heat Gain Muscles will Relax to Minimise Heat Generation	Hair Erector Muscles will Contract to Trap Warm, Still Air Close to the Skin for Insulation Vasoconstriction, Vessels Near the Skin will Constrict to Minimise Blood Supply to Surface so Reduces Radiated Heat Loss Sweat Glands will Stop Excreting Sweat to Prevent Evaporative Cooling Layer of Fat Prevents Radiated Heat Loss (Insulation) Muscles will Shiver and Contract for Heat Generation