So, there are 2 main ways your body regulates temperature, or in this case “warm up”.
They are:
* Shivering thermogenesis
* Eli5: Your body rapidly contracts it’s muscles in order for some of the stored chemical energy in your body, to become Kinetic energy (Movement), and for some of that chemical energy that is being converted, to be released as heat. This uses a LOT of our “energy molecules” which could either be Glucose (sugar) or triglycerides (fat). Essentially we literally burn fat or stored sugar it like we would burn any fuel, such as gasoline, in order to get heat as a by product.
* Brown Adipose thermogenesis
* This is what we call “Brown Fat”. This type of tissue is different from other types of fat as it is abundant in mitochondria (the power house of the cell). And the principal is the same as before. We increase our lisis (rupture, in order to be used) of the “energy molecules” we talked about before, how ever, not all of that energy is used to create ATP(basically fuel for energy our body can use, like diesel or gasoline for a car), and instead that stored chemical energy is simply released as heat.
Cooling mechanisms are much different!
I can give a much more complicated and in depth explanation if you’d like, but I tried to keep it simple.
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