Like where does the warmth come from?
In: Chemistry
When cells do work, they create energy. Energy flows from areas of high energy to low energy.
ATP, the major molecular energy store, is broken by our cells, and 40 percent is used to power our cells. The other 60 is released as heat.
https://en.m.wikipedia.org/wiki/ATP_hydrolysis
That energy mostly comes from our deep organs (liver, brain, heart) as that’s where work is done. And the heat is distributed throughout our bodies by simple radiating or our fluid systems (blood and lymph). Muscles also use and create more energy and heat than other parts of our body (like fat).
That level is regulated by our hippocampus, which freaks out often and tries to kill us for little reason.
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