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…showed last 75 words of 773 total…the only patches of the membrane that are freely permeable to hydrogen ions. The complex of proteins functions as a mill that harnesses the exergonic flow of hydrogen ions to drive the phosphorylation of ADP. Thus, an hydrogen ion gradient couples the redox reactions of the electron transport chain to ATP synthesis. This coupling mechanism for oxidative phosphorylation is called chemiosmosis a term that highlights the relationship between chemical reactions and transport across a membrane.