Blood vessels controlling heat gain/loss

High temperature - skin arteriole vaso-dilate while shunt vessels vaso-contract, diverting blood to the capillaries, bringing warm blood near the surface of skin so heat is more easily lost via convection, conduction, radiation, and the evaporation of sweat as latent heat of vaporisation, increasing heat loss low temperature - skin arteriole vaso-constrict while shunt vessels vaso-dilate, diverting blood away from the capillaries, bringing warm blood further away the surface of skin so heat is less easily lost via convection, conduction, radiation, and the evaporation of sweat as latent heat of vaporisation, reducing heat loss