Cools blood and heart. Disadvantages requires muscular work, causing increased heat production rapid breathing causes alkalosis c. Peripheral vasodilation requires temperature gradient to work. Used by large animals, e.g. camels. This works as a water saving mechanism. Requires circulatory adaptation to protect brain.
Blood is circulated through the nasal passages first to cool it off, then it goes to the brain.
Take advantage of conduction or convection ii. Avoid radiation, e.g. by burrowing iii. Give up and go torpid. E.g. estivation by lungfish. V. Control of Thermoregulation A. Hypothalamic temperature set point 1.