ATP is compared to a rechargeable battery because it is like a package of energy that provides power to the electronic device and when the battery gets worn-out it can be charged with the help of a charger.
Through the process of cell respiration, the energy present in the food is converted energy that can be used by the cell. This process converts glucose and oxygen into carbon dioxide and water, and energy is transferred in the form of ATP.
ATP meaning Adenosine Triphosphate is used up by the cell by breaking ATP into ADP, full formed as Adenosine Diphosphate and phosphate P₍i₎.
ATP → ADP + P₍i₎
This used up or worn out ATP can be recharged by attaching new phosphate to ADP, hence rebuilding ATP.
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