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Our body prodI've been told that all of our heat is generated from chemical reactions when your body converts sugars to energy. If this is the case why do reptiles need to get heat from the sun as I'm sure they have to convert sugars to energy as well? And what in our body regulates that temprature so that it remains steady and then even elevates during times of infection?uce heat from k.e. 
which part of the body produce heat
Most body heat is generated in the deep organs, especially the liver, brain, and heart, and in contraction of skeletal muscles. i dont sure
the food we eat will broke into small tiny pieces until they were absorbed by the small intestine. then these molecules were send to the cells, lipid molecules, amino acids etc through the blood cappilleries to gain energy. the cells use carbohydrates to gain energy, in that process lot of energy will be released. these carbohydrates is absorbed as glucose. then these are metabolize into water and carbon dioxide and the ATP also forms here which is called as energy currency. here some heat is released during this process, such that ADP produces. thus heat is produced. generally we call this reactions as exothermic reations.
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thankz for helping me
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whr is ur plsr