There are many thousands of chemical reactions that need to take place in our bodies constantly for us to be alive. That temperature is the ideal range where these reactions can take place. If our body temperature gets too high or too low, these chemical reactions don’t happen, don’t happen fast enough, or don’t happen correctly, and that leads to death eventually. It’s important to note that 37 Celsius (98.6 Fahrenheit) is just an average. Normal body temperatures can be a few degrees above or below that, and in fact, our body temperatures fluctuate by several degrees over the course of a day, so it’s not dangerous to go even slightly above or below that number, it’s only dangerous if it goes too far above or below the range of temperatures that is considered normal.
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