The standard body temperature is 98.6 degrees Fahrenheit (37°C). This reading has been accepted since 1871 by Wunderlich. A healthy temperature range is between 97 to 99°F
Rectal thermometer is most accurate for infants under 3 months. It's inserted into rectum to check internal body temperature. Less affected by environmental factors than oral thermometers
Body temperature varies by location and method of measurement. Rectal temperature is most accurate for infants under 3 months. Oral temperature requires tight lip clamping and nose breathing. Forehead and armpit readings can be slightly lower than mouth
Homeostasis is self-regulating processes maintaining stability for survival. Claude Bernard explored concept in 1849, Walter Cannon coined term in 1926. Systems reach steady state through feedback control when disturbed
Hypothermia occurs when body temperature drops below 95°F. Mild hypothermia is 90-95°F, moderate 82-90°F, severe below 82°F. Core temperature measures internal organs, not skin surface
Normal adult body temperature ranges between 36.5-37.5°C. Hypothermia occurs below 36°C (95°F). Feverishness is between 37.1°C and 37.9°C (98.7-100.22°F). Hyperthermia is above 38°C (100.4°F)