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Why do humans have definite body temperatures?

Updated: 8/18/2019
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Humans have definite body temperatures, that is, body temperatures within a certain range, because the hypothalamus regulates the body temperature to maintain normal processes in all animals.

All living things need some kind of temperature control in order to keep their operating systems working normally.

Humans ideally maintain a core body temperature of approximately 37 degrees Celsius, or 98.6 degrees Fahrenheit, though this varies depending on how or where on, or in, the body the temperature is measured. Other factors such as physical activity, time of day, environment, and so on, will cause minor fluctuations within the normal temperature range.

All living things and artifacts have optimum temperature ranges for normal operation: for example, your television set, your motor vehicle, the small lizard catching bugs in your garden, and the bugs and the garden themselves, all operate within a specific temperature range. If illness or other malfunction, or environmental fluctuations, cause their temperature to rise or fall outside of the range normal for them, they will experience problems.

This is why you keep confined domestic animals out of direct sunlight, install your electrical appliances where good airflow is maintained, and wear appropriate clothing or otherwise adjust your environmental conditions in order to keep yourself at a comfortable temperature.

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