Changes

==Introduction==

==Introduction==

In order to maintain a constant body temperature as is possible in '''homeotherms''', heat must be transported to the surface of the skin via the blood and released into the environment.  The cooled blood then returns to the body core, thus reducing core temperature.  If heat from metabolism were not removed from the body, the core temperature of mammals and birds would increase by approximately 2.5 C per hour.

In order to maintain a constant body temperature as is possible in '''homeotherms''', heat must be transported to the surface of the skin via the blood and released into the environment via conduction, convection, radiation or the evaporation of sweat.  The cooled blood then returns to the body core, thus reducing core temperature.  If heat from metabolism were not removed from the body, the core temperature of mammals and birds would increase by approximately 2.5 C per hour.

==Physiology==

==Physiology==