I can trace my ancestry back 100 million years and I do many of the same jobs for you today that I have done since the earliest primitive creatures began to appear on earth. Take the matter of temperature control. Thanks to me, you can survive in Siberia when the temperature drops as low as -90 degree F., or in Libya when it climbs to 136 degree. In either place, I will keep your internal environment about a steady 98.6 degree. Let it vary by more than a few degrees either up or down, and you would be a goner.
Tags: Hypothalamus, job of hypothalamus, role of hypothalamus