The energy to generate heat has to come from somewhere. Is it the friction of the blood pumping through the veins and tissues in your body? Is there some kind of chemical heat generation at the cellular level? Where does the heat come from?
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Breaking down foods we eat releases energy, so does the breakdown of ANY molecule. the energy is stored in the chemical bonds and released.
In order for you to stay alive, our bodies constantly break and re-make this chemical called ATP. It’s used for literally everything. Every muscle contraction, for your heart to beat, every process your conscious mind isn’t aware of, all require the breakdown of ATP.
So we break down ATP and the energy released is used for many different things, including the manufacture of more ATP. (Breaking bonds releases energy, making bonds requires energy).
Our efficiency for using this energy is pretty bad. We only utilize roughly 30% of the energy released from the breakdown of an ATP. That remaining 70% is lost to heat
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