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Not such an easy answer. Mitochondria, which are present in every cell of the body, is what allows us to convert glucose into a more usable form of energy called ATP. Of course our nervous system is what signals when we're hungry. Inhaling delicious smells via our respiratory system stimulates the digestive system to produce saliva and production oof stomach acid to prepare breaking down the food. Our muscles and bones allow us to get the food to our mouths. The cardiovascular system delivers the glucose to the individual cells. Back to the respiratory system, we require oxygen to convert that glucose efficiently produce enough ATP to power the cells. And all of this happens in the mitochondria in each one of our cells. Like I said, not such and easy answer.

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