Answer :
Energy is released as the electrons travel along the inner mitochondrial membrane's electron transport chain, and this energy is used to push protons against their concentration gradient out of the mitochondrial matrix and into the intermembranous space.
A membrane, a gradient of protons across the membrane, the membrane-localized molecular enzyme ATP synthase, ADP, and inorganic phosphate are all that are required for a cell to make ATP. The proton gradient across the membrane provides the energy needed to drive ATP synthesis.
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