Final answer:
The normal range for a healthy animal is the spread of values around the setpoint that is considered insignificant.
Step-by-step explanation:
Establishing a normal range or "normal" values for a healthy animal
For any given variable, such as body temperature or blood glucose level, there is a particular setpoint that is the physiological optimum value.
The spread of values within which fluctuations are considered insignificant is called the normal range. In the case of body temperature, the normal range for an adult is about 36.5 to 37.5 °C (97.7 to 99.5 °F).