Is it our blood going through the heart, but in that case wouldn’t that mean our heart is a furnace?
In: Biology
So a few things actually. The primary way is sweat and blood flow. When you are hot you will sweat. The evaporation of the water will cool the body down. When cold your body constricts blood flow to the surface of the skin so you loose less heat. Heat in the body is produced by biological activity. This largely takes place in the muscles and digestion. This is why you shiver when cold. It increases the activity in the muscles thus producing heat. On a technical level the heart does produce heat as well, it is a muscle after all, but the amount is little compared to the other muscles in the body especially those in the legs and back. There are other factors that impact body temp such as heat exchange when breathing but these are less notable.
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