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The term glycolysis has originated from the Greek word, glycos for sugar and lysis for break down or splitting . This process takes place in the cytoplasm . Glycolysis is called common pathway , Because common in aerobic and anaerobic respiration. Glycolysis is 10 step process and 1 ,3, and 10 reaction are irreversible.           Glucose breakdown 10 step Glucose are Partial breakdown to form two molecules of pyruvic acid.

Electron transport system utilisation of energy store in NADH+H and FADH^2 form NADH  and FADH are oxidized through electron transport system and electron are passed on to  O2 resulting in the formation of H2O. Electron carrier   flavian FeS Quinone Cytochrome ETS is consists of four complex and Fifth Complex is ATP synthase.   complex 1st- FMN  complex 2nd - FeS complex 3rd- cytochrome b  complex 4th  complex 5th- ATP synthase                  ETS Diagram  During electron transport system of respiration UQ and FMN can release h + ion in Peri mitochondria space and H+ ion concentration across inner mitochondrial membrane. Electron back to the Matrix and through F° part of ATP ase  passage 2H+ ion  through F°  proton channel synthesis of 1 ATP            This Diagram is F°and F1

Kreb cycle also called tri cyclic acid and names give Hans krebs .  Cycle occur in mitochondria matrix of eukaryotic cells and cytoplasm of prokaryotic cell.  krebs cycle involves Four dehydrogenase , two'carboxylase and one substrate level phosphorylation . OAA is considered as the first member of the cycle and all Enzyme of Krebs cycle are located inside mitochondria Matrix except succinate dehydrogenase which is located in inner membrane of mitochondria.