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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?!

    Your question is answered here.

    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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