I know that moving my arm requires energy, and energy is not created or destroyed. I know the energy isn’t just disappearing but I know it’s not in my body still because I can run out of energy. Where does the energy I lose go?
In: Biology
The energy we use in our body generally comes from burning fat and sugars. Burning in this case means that you break the molecule apart. Both sugar and fat are a long strain of carbon atoms bound together (C-C-C-C-C-C, etc) and breaking the bonds between these carbons gives energy that our cells can use to move molecules around.
The now broken apart carbon we exhale as CO2, and the energy itself is used and ultimately we radiate as heat.
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