eli5 How does your body raise and lower it’s own temperature?
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Our body naturally produces heat as part of metabolism. Every cell does it. Usually the problem is too much heat, so our bodies developed systems to shed it, like the networks of blood vessels in our skin and sweating. Most of the time, to combat cold, all our body needs to do is restrict this cooling. But if you need extra heat, some of our cells need to work overtime. That’s what shivering essentialy is, doing “useless” work for the sake of generating heat.
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