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1.
NADH and FADH2 delivers e- and H+ to ETC in inner membrane. Come from glycolysis and C.A.C
2.
Energy lost by e- moving through ETC (step-wise) fuels active transport of H+ from the matrix to intermembrane space. H+ gradient forms across inner membrane.
3.
H+ flow back to the matrix through ATP synthase drives the formation of ATP from ADP and phosphate (Pi).
4.
Oxygen accepts e- and H+ at the end of the ETC. Oxygen is the final electron acceptor. Water forms.