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How on earth does breaking down Glucose or ATP to ADP release energy?!

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    Breaking bonds is endothermic - heat energy is taken in.
    So, my book says that the breaking down of glucose 'releases energy used in the synthesis of ATP' - how is that possible heat energy is taken in?

    Additionally, when ATP is released to ADP & Pi, how does this release energy since again, the bond breaking is endothermic? Does the Pi bond again with the ADP to form ATP?! what's the case?!
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    Your question is answered here.
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    For A level biology, the easy way to understand this process is as below - unless you want to comprehend a whole page of complex astrophysics in the link provided above.

    Bond formation is not necessarily exothermic - when a high energy particle such as phosphate (actually PO3-) is liberated, it results in release of energy - this energy was previously "stored" as chemical potential energy during the formation of the ATP from ADP and Pi.

    Yes, I agree that a slight "error" is apparent in this argument resulting from the simplification, but for A level biology, which capitalizes on simplicity, it is actually better than a long-winded detailed explanation.
 
 
 
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