Final answer:
The normal human body temperature on the Celsius scale is 37.0°C and varies around this setpoint within a normal range that maintains homeostasis.
Step-by-step explanation:
The normal human body temperature on the Celsius scale is 37.0°C. While this is considered the average, actual body temperatures can vary. The human body maintains this temperature through exothermic reactions in the digestion process, which help to keep the temperature within a normal range, fluctuating between 36.5°C and 37.5°C (97.7°F to 99.5°F). Variations in body temperature, such as a rise above 37.5°C or 38.3°C, can indicate fever or hyperthermia, while temperatures below 35.0°C indicate hypothermia.