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All living things break down food molecules, which releases energy and some of the energy is released as thermal energy, on the cellular level. All the trillions of cells making energy heat up the body. Our bodies being mainly composed of water, over 70%, helps mainly heat due to water's high specific heat capacity, and the little bit of fat also acts as an insulator. Hair helps keep by acting a barrier and numerous other way. On a small scale the body diverts blood flow from veins, arteries and capillaries that are close to the surface of your skin to reduce heat, and releases hormones to increase the breaking down of food and if your body gets cold enough, you will shiver causing your muscles to contract creating frictions which help warm up the body.

I hope that answers your question

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14y ago

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