lowest body temp. usually during sleep
40% lost through the head
fingers, toes, nose, and ears
hypothermia is more dangerous, the body's core temp. drops below 95 degrees
body's natural salts
heat cramps-painful muscle spasms, heat fainting-while working in the heat the water blood vessels do not dilate, heat exhaustion-lots of sweating, tired, confused, and dizzy, heat stroke-most severe; needs medical attention